Same thing just happened to me. Not sure whether to blame System Restore, or Subversion (or TortoiseSVN), but they do not play nicely together.

1) Comp was playing up due to new network settings.
2) Did a System Restore to two days ago.
3) Two days’ worth of C# code disappeared.
4) Undid that System Restore, so my code reappeared and the comp started playing up again.
5) Committed all my work to Subversion. (Using TortoiseSVN, btw, in case it’s not a Subversion bug, but a Tortoise bug?)
6) Repeated step #2. Again, two days’ worth of code disappeared.
7) Did a Revert, and Subversion restored my missing work.

The above is the technique I recommend for anyone who *didn’t* perform a Commit before they did that first Restore.

Glad both you and I were able to recover.

-Geoff.