Animation import problem

I’ve tried to export animation from 3dx max 2011 file. But they wouldn’t appear in Unity. The strange thing is that animations appeared in Unity a couple of days ago, but after reimport it just doesn’t work anymore (no animation at all).

I"ve already tried FBX 2009, 2010 and 2011 versions. I have Unity 3.0 f5 Pro version.

Ok, deleting the whole project and rebuilding it solved the problem… I hope such things will now happen too often. Because it is a lot of headache, when you have a large-scale project and have to rebuild everything.