Lost data upgrading roms, but data is still there when viewed with Clockwork and Clockwork alone. Can I recover it?
If you were going from CM10 to CM10.1 — that is, moving from Android 4.1 to 4.2 — your data "loss" is probably because the path to your emulated SD card has changed due to the new multiuser support.  Previously, the SD card was /data/media, but now it's a subdirectory such as /data/media/0, with additional subdirectories (such as /data/media/1) for additional user accounts.  The files should've been moved to the new location automatically when you first booted CM10.1, but maybe that didn't happen.

Using a root file manager or shell, create a /data/media/0 directory if it doesn't exist already, and then move all the other files from /data/media into the 0 subdirectory, and it should become visible within Android again.



If you use ClockworkMod for backups, you may find that it can no longer find your backups directory, because it's still looking for /data/media/clockworkmod, not /data/media/0/clockworkmod.  You can fix that by creating a symlink in the old location.  From a root shell, run these two commands:

cd /data/media
ln -s 0/clockworkmod clockworkmod