Upgraded to 0.4.2 today and now get these nasty yellow boxes everywhere. Found similar posts on this forum, but no fix worked for me. Here is the notice and backtrace:
Notice: Undefined index: debugTrackVisitsInsidePiwikUI in /home/224/mydomain/www.mydomain.net/public_html/piwik/tmp/templates_c/%%1D^1D5^1D598A14%%piwik_tag.tpl.php on line 3
Backtrace -->
#0 Piwik_ErrorHandler(8, Undefined index: debugTrackVisitsInsidePiwikUI, /home/224/mydomain/www.mydomain.net/public_html/piwik/tmp/templates_c/%%1D^1D5^1D598A14%%piwik_tag.tpl.php, 3, Array ([this] => Piwik_Smarty Object ([template_dir] => Array ([0] => /home/224/mydomain/www.mydomain.net/public_html/piwik/plugins,[1] => /home/224/mydomain/www.mydomain.net/public_html/piwik/themes/default,[2] => /home/224/mydomain/www.mydomain.net/public_html/piwik/themes),[compile_dir] => /home/224/mydomain/www.mydomain.net/public_html/piwik/tmp/templates_c,[config_dir] => configs,[plugins_dir] => Array ([0] => /home/224/mydomain/www.mydomain.net/public_html/piwik/core/SmartyPlugins,[1] => /home/224/mydomain/www.mydomain.net/public_html/piwik/libs/Smarty/plugins),[debugging] => 1,[error_reporting] => 6143,[debug_tpl] => ,[debugging_ctrl] => NONE,[compile_check] => 1,[force_compile] => ,[caching] => 0,[cache_dir] => /home/224/mydomain/www.mydomain.net/public_html/piwik/tmp/cache,[cache_lifetime] => 3600,[cache_modified_check] => ,[php_handling] => 0,[security] => ,[secure_dir] => Array (),[security_settings] => Array ([PHP_HANDLING] => ,[IF_FUNCS] => Array ([0] => array,[1] => list,[2] => isset,[3] => empty,[4] => count,[5] => sizeof,[6] => in_array,[7] => is_array,[8] => true,[9] => false,[10] => null),[INCLUDE_ANY] => ,[PHP_TAGS] => ,[MODIFIER_FUNCS] => Array ([0] => count),[ALLOW_CONSTANTS] => ,[ALLOW_SUPER_GLOBALS] => 1),[trusted_dir] => Array (),[left_delimiter] => {,[right_delimiter] => },[request_vars_order] => EGPCS,[request_use_auto_globals] => 1,[compile_id] => ,[use_sub_dirs] => ,[default_modifiers] => Array (),[default_resource_type] => file,[cache_handler_func] => ,[autoload_filters] => Array (),[config_overwrite] => 1,[config_booleanize] => 1,[config_read_hidden] => ,[config_fix_newlines] => 1,[default_template_handler_func] => ,[compiler_file] => Smarty_Compiler.class.php,[compiler_class] => Smarty_Compiler,[config_class] => Config_File,[_tpl_vars] => Array ([SCRIPT_NAME] => /piwik/index.php,[tag] => piwik=0.4.2,[piwikUrl] => http://www.mydomain.net/piwik/,[adminSites] => Array ([0] => Array ([idsite] => 1,[name] => mydomain.net,[main_url] => http://www.mydomain.net,[ts_created] => 2009-02-08 23:10:15,[feedburnerName] => ,[alias_urls] => Array ([0] => http://www.mydomain.net))),[menu] => Array ([Plugins] => Array ([module] => CorePluginsAdmin,[action] => index),[Users] => Array ([module] => UsersManager,[action] => index),[Websites] => Array ([module] => SitesManager,[action] => index)),[currentModule] => SitesManager,[currentPluginName] => Sites Management,[userLogin] => justin,[sites] => Array ([0] => Array ([idsite] => 1,[name] => mydomain.net,[main_url] => http://www.mydomain.net,[ts_created] => 2009-02-08 23:10:15,[feedburnerName] => )),[showWebsiteSelectorInUserInterface] => 1,[url] => http://www.mydomain.net,[token_auth] => 991f827ff2e71c9c580f6ec26b53eb3a,[userHasSomeAdminAccess] => 1,[userIsSuperUser] => 1,[piwik_version] => 0.4.2,[latest_version_available] => ,[loginModule] => Login,[totalTimeGeneration] => 0.190,[totalNumberOfQueries] => 0,[showSitesSelection] => ,[showPeriodSelection] => ,[site] => Array ([idsite] => 1,[name] => mydomain.net,[main_url] => http://www.mydomain.net,[ts_created] => 2009-02-08 23:10:15,[feedburnerName] => ,[alias_urls] => Array ([0] => http://www.mydomain.net)),[i] => 0),[_smarty_vars] => ,[_sections] => Array (),[_foreach] => Array ([menu] => Array ([total] => 3,[iteration] => 3)),[_tag_stack] => Array (),[_conf_obj] => ,[_config] => Array ([0] => Array ([vars] => Array (),[files] => Array ()),[1] => Array ([vars] => Array (),[files] => Array ()),[2] => Array ([vars] => Array (),[files] => Array ())),[_smarty_md5] => f8d698aea36fcbead2b9d5359ffca76f,[_version] => 2.6.25,[_inclusion_depth] => 2,[_compile_id] => ,[_smarty_debug_id] => SMARTY_DEBUG,[_smarty_debug_info] => Array ([0] => Array ([type] => template,[filename] => SitesManager/templates/SitesManager.tpl,[depth] => 0),[1] => Array ([type] => template,[filename] => CoreAdminHome/templates/header.tpl,[depth] => 1,[exec_time] => 0.08324408531189),[2] => Array ([type] => template,[filename] => CoreHome/templates/js_global_variables.tpl,[depth] => 2,[exec_time] => 0.00049114227294922),[3] => Array ([type] => template,[filename] => CoreHome/templates/top_bar.tpl,[depth] => 2,[exec_time] => 0.078906059265137),[4] => Array ([type] => template,[filename] => CoreHome/templates/header_message.tpl,[depth] => 2,[exec_time] => 0.00096607208251953),[5] => Array ([type] => template,[filename] => CoreHome/templates/logo.tpl,[depth] => 2,[exec_time] => 0.00070905685424805),[6] => Array ([type] => template,[filename] => CoreHome/templates/js_disabled_notice.tpl,[depth] => 2,[exec_time] => 0.00055909156799316),[7] => Array ([type] => template,[filename] => CoreAdminHome/templates/menu.tpl,[depth] => 1,[exec_time] => 0.00085783004760742),[8] => Array ([type] => template,[filename] => CoreAdminHome/templates/footer.tpl,[depth] => 1),[9] => Array ([type] => template,[filename] => CoreHome/templates/piwik_tag.tpl,[depth] => 2)),[_cache_info] => Array (),[_file_perms] => 420,[_dir_perms] => 505,[_reg_objects] => Array (),[_plugins] => Array ([modifier] => Array ([translate] => Array ([0] => smarty_modifier_translate,[1] => SitesManager/templates/SitesManager.tpl,[2] => 27,[3] => 1,[4] => 1),[count] => Array ([0] => count,[1] => SitesManager/templates/SitesManager.tpl,[2] => 33,[3] => 1,[4] => 1),[urlRewriteWithParameters] => Array ([0] => smarty_modifier_urlRewriteWithParameters,[1] => CoreHome/templates/top_bar.tpl,[2] => 5,[3] => 1,[4] => 1)),[function] => Array ([loadJavascriptTranslations] => Array ([0] => smarty_function_loadJavascriptTranslations,[1] => SitesManager/templates/SitesManager.tpl,[2] => 1,[3] => 1,[4] => 1),[url] => Array ([0] => smarty_function_url,[1] => SitesManager/templates/SitesManager.tpl,[2] => 55,[3] => 1,[4] => 1),[postEvent] => Array ([0] => smarty_function_postEvent,[1] => CoreAdminHome/templates/header.tpl,[2] => 25,[3] => 1,[4] => 1),[assignTopBar] => Array ([0] => smarty_function_assignTopBar,[1] => CoreHome/templates/top_bar.tpl,[2] => 1,[3] => 1,[4] => 1)),[block] => Array (),[compiler] => Array (),[prefilter] => Array (),[postfilter] => Array (),[outputfilter] => Array ([cachebuster] => Array ([0] => smarty_outputfilter_cachebuster,[1] => ,[2] => ,[3] => 1,[4] => 1),[trimwhitespace] => Array ([0] => smarty_outputfilter_trimwhitespace,[1] => ,[2] => ,[3] => 1,[4] => 1)),[resource] => Array (),[insert] => Array ()),[_cache_serials] => Array (),[_cache_include] => ,[_cache_including] => ,[_supers] => Array ([get] => Array ([module] => SitesManager,[action] => index,[idsite] => 1),[post] => Array (),[server] => Array ([HTTP_HOST] => www.mydomain.net,[HTTP_USER_AGENT] => Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.9.0.12) Gecko/2009070611 Firefox/3.0.12 (.NET CLR 3.5.30729),[HTTP_ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8,[HTTP_ACCEPT_LANGUAGE] => en-gb,en;q=0.5,[HTTP_ACCEPT_ENCODING] => gzip,deflate,[HTTP_ACCEPT_CHARSET] => ISO-8859-1,utf-8;q=0.7,*;q=0.7,[HTTP_KEEP_ALIVE] => 300,[HTTP_CONNECTION] => keep-alive,[HTTP_REFERER] => http://www.mydomain.net/piwik/index.php?module=CorePluginsAdmin&action=index&idsite=1,[HTTP_COOKIE] => piwik_visitor1=1%3DNTk4OGJiMDQ2NGJhM2VlM2Q3YTUwYmY2OWEwOGY0ZGQ%3D%3A2%3DMTI0ODgxODkxOQ%3D%3D%3A3%3DMTI0ODgxNTYzNw%3D%3D%3A4%3DNTUxMw%3D%3D%3A5%3DOTQ%3D%3A11%3DMQ%3D%3D; piwik_auth=login%3DanVzdGlu%3Atoken_auth%3DOTkxZjgyN2ZmMmU3MWM5YzU4MGY2ZWMyNmI1M2ViM2E%3D; __utma=269525992.3964434827326193700.1241300998.1247923280.1248815623.12; __utmz=269525992.1241300998.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __utmc=269525992; PHPSESSID=b1jmla3nas62vr4hl0qjquuho4,[PATH] => /sbin:/usr/sbin:/bin:/usr/bin,[SERVER_SIGNATURE] => <address>Apache/2.2.3 Server at www.mydomain.net Port 80</address>
,[SERVER_SOFTWARE] => Apache/2.2.3,[SERVER_NAME] => www.mydomain.net,[SERVER_ADDR] => 217.8.240.44,[SERVER_PORT] => 80,[REMOTE_ADDR] => 80.189.50.187,[DOCUMENT_ROOT] => /home/224/mydomain/www.mydomain.net/public_html/,[SERVER_ADMIN] => webmaster@mydomain.net,[SCRIPT_FILENAME] => /home/224/mydomain/www.mydomain.net/public_html/piwik/index.php,[REMOTE_PORT] => 58372,[GATEWAY_INTERFACE] => CGI/1.1,[SERVER_PROTOCOL] => HTTP/1.1,[REQUEST_METHOD] => GET,[QUERY_STRING] => module=SitesManager&action=index&idsite=1,[REQUEST_URI] => /piwik/index.php?module=SitesManager&action=index&idsite=1,[SCRIPT_NAME] => /piwik/index.php,[PHP_SELF] => /piwik/index.php,[REQUEST_TIME] => 1248822743),[session] => Array (),[request] => Array ([module] => SitesManager,[action] => index,[idsite] => 1,[piwik_visitor1] => 1=NTk4OGJiMDQ2NGJhM2VlM2Q3YTUwYmY2OWEwOGY0ZGQ=:2=MTI0ODgxODkxOQ==:3=MTI0ODgxNTYzNw==:4=NTUxMw==:5=OTQ=:11=MQ==,[piwik_auth] => login=anVzdGlu:token_auth=OTkxZjgyN2ZmMmU3MWM5YzU4MGY2ZWMyNmI1M2ViM2E=,[__utma] => 269525992.3964434827326193700.1241300998.1247923280.1248815623.12,[__utmz] => 269525992.1241300998.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none),[__utmc] => 269525992,[PHPSESSID] => b1jmla3nas62vr4hl0qjquuho4),[cookies] => Array ([piwik_visitor1] => 1=NTk4OGJiMDQ2NGJhM2VlM2Q3YTUwYmY2OWEwOGY0ZGQ=:2=MTI0ODgxODkxOQ==:3=MTI0ODgxNTYzNw==:4=NTUxMw==:5=OTQ=:11=MQ==,[piwik_auth] => login=anVzdGlu:token_auth=OTkxZjgyN2ZmMmU3MWM5YzU4MGY2ZWMyNmI1M2ViM2E=,[__utma] => 269525992.3964434827326193700.1241300998.1247923280.1248815623.12,[__utmz] => 269525992.1241300998.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none),[__utmc] => 269525992,[PHPSESSID] => b1jmla3nas62vr4hl0qjquuho4),[env] => Array ([CONSOLE] => /dev/console,[SELINUX_INIT] => YES,[TERM] => linux,[INIT_VERSION] => sysvinit-2.86,[PATH] => /sbin:/usr/sbin:/bin:/usr/bin,[runlevel] => 3,[RUNLEVEL] => 3,[PWD] => /,[LANG] => C,[previous] => N,[PREVLEVEL] => N,[SHLVL] => 3,[HOME] => /,[_] => /usr/sbin/httpd))),[params] => Array ([smarty_include_tpl_file] => CoreHome/templates/piwik_tag.tpl,[smarty_include_vars] => Array ()),[_params] => Array (),[debug_start_time] => 1248822744.0764,[included_tpls_idx] => 9,[_smarty_compile_path] => /home/224/mydomain/www.mydomain.net/public_html/piwik/tmp/templates_c/%%1D^1D5^1D598A14%%piwik_tag.tpl.php)) called at [/home/224/mydomain/www.mydomain.net/public_html/piwik/tmp/templates_c/%%1D^1D5^1D598A14%%piwik_tag.tpl.php:3]
#1 include(/home/224/mydomain/www.mydomain.net/public_html/piwik/tmp/templates_c/%%1D^1D5^1D598A14%%piwik_tag.tpl.php) called at [/home/224/mydomain/www.mydomain.net/public_html/piwik/libs/Smarty/Smarty.class.php:1889]
#2 Smarty->_smarty_include(Array ([smarty_include_tpl_file] => CoreHome/templates/piwik_tag.tpl,[smarty_include_vars] => Array ())) called at [/home/224/mydomain/www.mydomain.net/public_html/piwik/tmp/templates_c/%%C1^C18^C18D9C58%%footer.tpl.php:5]
#3 include(/home/224/mydomain/www.mydomain.net/public_html/piwik/tmp/templates_c/%%C1^C18^C18D9C58%%footer.tpl.php) called at [/home/224/mydomain/www.mydomain.net/public_html/piwik/libs/Smarty/Smarty.class.php:1889]
#4 Smarty->_smarty_include(Array ([smarty_include_tpl_file] => CoreAdminHome/templates/footer.tpl,[smarty_include_vars] => Array ())) called at [/home/224/mydomain/www.mydomain.net/public_html/piwik/tmp/templates_c/%%A6^A6A^A6A3DC79%%SitesManager.tpl.php:101]
#5 include(/home/224/mydomain/www.mydomain.net/public_html/piwik/tmp/templates_c/%%A6^A6A^A6A3DC79%%SitesManager.tpl.php) called at [/home/224/mydomain/www.mydomain.net/public_html/piwik/libs/Smarty/Smarty.class.php:1283]
#6 Smarty->fetch(SitesManager/templates/SitesManager.tpl) called at [/home/224/mydomain/www.mydomain.net/public_html/piwik/core/View.php:124]
#7 Piwik_View->render() called at [/home/224/mydomain/www.mydomain.net/public_html/piwik/plugins/SitesManager/Controller.php:28]
#8 Piwik_SitesManager_Controller->index() called at [(null):0]
#9 call_user_func_array(Array ([0] => Piwik_SitesManager_Controller Object ([] => SitesManager,[] => 2009-07-28,[] => Piwik_Date Object ([] => 1248735600),[] => Array ([label] => General_ColumnLabel,[nb_visits] => General_ColumnNbVisits,[nb_actions] => General_ColumnNbActions,[max_actions] => General_ColumnMaxActions,[sum_visit_length] => General_ColumnSumVisitLength,[nb_uniq_visitors] => General_ColumnNbUniqVisitors,[nb_actions_per_visit] => General_ColumnActionsPerVisit,[avg_time_on_site] => General_ColumnAvgTimeOnSite,[bounce_rate] => General_ColumnBounceRate,[revenue_per_visit] => General_ColumnValuePerVisit,[goals_conversion_rate] => General_ColumnVisitsWithConversions)),[1] => index), Array ()) called at [/home/224/mydomain/www.mydomain.net/public_html/piwik/core/FrontController.php:119]
#10 Piwik_FrontController->dispatch() called at [/home/224/mydomain/www.mydomain.net/public_html/piwik/index.php:53]