Having some issues with 0.5.4 from the latest.zip
When unpacked, running the installed gives an immediate
Error: Unable to mkdir /var/www/vhosts/–blah–/piwik/tmp/sessions
Changing the permissions from the command line then can fix this, but once installed a successful login just loops back to the login page (with correct or incorrect password and no message).
Any suggestions or has anyone seen this before?