You aren't the first one to report this, no. Problem is I have no clue how or why this would happen. I recall one user saying the temp files are created, but they aren't seen by the game--which I don't know how to solve currently if the game is still finding content packs properly. They're in the same location and everything.
If possible, I'd like to confirm with you that you were playing version 0.5.3 and that the preservation files were created in the /.temp/ folder, but unfortunately I don't have a solution either way at the moment. I wish I did.