E.g. when opening 'ticket hours grouped by component' report the following error message appears:
Report execution failed: (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'REAL) as Estimated_work,\n CAST(totalhours.value as REAL) as Total_work,\n ' at line 11")
This error seems to be related to the fact that MySQL doesn't support casting to REAL. (http://dev.mysql.com/doc/refman/5.0/en/differences-from-ansi.html).
I haven't had time to test it yet but I guess the problem could be solved by replacing REAL with DECIMAL.