ClickHeat problem

I just upgrade piwik to version 0.9, but i have some problems with clickheat plugin.
Where are some notice with already declared constants: Notice: Constant CLICKHEAT_PATH already defined in… and i can’t see the reports.
Any ideas?

http://dev.piwik.org/trac/ticket/73

The replies are for older versions.

There is a way to downgrade piwik to a previous version without losing datas?