WebPlayer can't handle Unity GUI?!

Hey guys, i'm developing a WebPlayer-Game right now using UnityGUI. Yesterday i added a lot of code using the GUI.tooltip feature (for mouseovers). Since I did that, Unity keeps crashing when I try to play the scene. This only happens in WebPlayer-BuildMode and in the WebPlayer build itself, the standalone version works fine. I got the feeling that it doesn't happen due to a specific piece of code because it doesn't matter what i comment-out, as soon as there are "too many" lines Unity crashes

I hope you understand what I mean...