As lots of users suggested, this new sub forum is now opened. You can post bug reports in here. This is much more useful than sourceforge's bug reporter, because we can discuss the problem here more easily, and post screenshots, urls and so on.
Please don't post problems in here, which are problems of your code. Please only report real problems of the engine. The more detailed the description of the bug, the better it is. If the problem can be seen easily, post a screenshot.
I guess lots of bugs will be reported here soon. Don't be angry if I am not able to fix it immediately. The engine is still young and it has lots of bugs. I'll try to do my best to fix them all, but I'll work on the more important bugs first. And I'll decide myself what it important, but for sure, I'll take into account what the users want and need.