What could the problem with mini.c:5054 vtable be?

I am currently developing an iPad app with MonoTouch. After a week development I finally got my iPad back for testing but now when I try to run the app on the iPad with the new version of monotouch (4.0) I get the following error:

• Assertion at ../../../../mono/mini/mini.c:5054, condition `vtable' not met

Stacktrace:

at System.TypeLoadException..ctor (string,string) <0x00023> at (wrapper runtime-invoke) object.runtime_invoke_dynamic (intptr,intptr,intptr,intptr) <0xffffffff>

On the simulator runs fine. Cle开发者_开发问答aning and rebuilding the solution didn't help. Any Ideas where I could start looking for the problem? Thanks

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I have seen this with one other users, and it was related to either linking a thumb library, or not rebuilding the solution entirely. If you are seeing this without this behaviour we will need you to file a bug attaching your solution and all the pertinent versions at http://monotouch.net/Support so we can work with you to determine why.

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It has been very strange. I did some more tests and found the following: my original project was called FliteLevel1, the test that I tried next with only a label was called FliteLevel2. Both didn't work. Today I decided to make another test and I called it Test4. This new test worked OK. So just to rule the possibility out I made a new test and called it FliteLevel3. This test didn't work either. The projects FliteLevel2, Test4 and FliteLevel3 all had exactly the same code but only Test4 worked. I rebuilt my project under a new name and it is working again. All very strange, and leaves you with a sense of Voodoo to the whole thing that is not cool.