5
Ok, it happened again, so maybe I didn't have anything to do with it the first time. It's a pretty standard shared server setup, with php running as nobody. The cache directory is worldwritable (rwxrwxrwx) so it should be able to create the file itself (if that is what it does).
Is there a reason this file isn't regenerating, should it regenerate? I suppose the better question is why is it being erased, but I'll tackle that once I get it working again.
It normally gets generated on the first login to admin, but it seems be be failing to create it...