Same problem here.
The error started yesterday when I tried to import a sprite directly to my layout by drag&droping from windows. A bug error poped up saying the sprite has problems with its collision poly.
I tried to import this png from the animation editor and it looked to work but today, when I tried to open the caproj, this error appeared.
Any ideas? Pless tell me I didn't loose my proyect.
Im working with the b99 on windows 7. Don't have a capx but I may attach the caproj if needed.
bye and thanks!