Andrew, look at a discussion on moodle.org, eg http://moodle.org/mod/forum/discuss.php?d=156962
Click on the "-" that is displayed on posts that don't have any ratings yet.
You get a popup with:
More information about this error
- line 379 of /lib/setuplib.php: moodle_exception thrown
- line 82 of /rating/index.php: call to print_error()
When there is ratings, it fares better, but still goes outside the window for me.
Can you check all this and clean it up?