Well, this probably won't help, but I had a strange problem with saves after one of the crashes I described here:
http://www.cyrodiil.net/forums/index.php/topic,1926.msg12970/topicseen.html#msg12970The crash happened instantly after I quicksaved.
Then, after game re-launch, it crashed to desktop instantly on attempt to enter the item of main menu where saved games are stored. On attempt to "continue game", it displayed warning that save was created for 0.00 version of the game instead of 1.*. Don't remember what version exactly I have, but it's a gold edition, so there are no patches to install for it.
I opened the saves folder, and the file with the latest save appeared to be absolutely OK - it had normal size etc. But after I deleted it, the issue was gone. Oblivion seems to be sensitive about saves. A bit more than it should be.