Source Filmmaker
Very annoying issue.
Some time ago, I was looking in the files of my SFM models, both in C: and D: paths, but after i loaded SFM up, some models in a session of mine were errors, and i could not find them in the animation set creator any longer. I recently, have stopped using SFM due to the issue. If i could fix it, I may start using it again.

Any ideas?