I have a folder which has both auto-decrypt and auto-shrink on. Just noticed that some of the files cannot play and checking the undelete folder (just turned the feature on) it seems the auto-decrypt had an error, there is an OK file in the auto-shrink so presumably that had run first. Could there have been a clash, or is something else causing a problem. I'd better check all the other auto-xxx files too.
libpostproc 52. 0.100 / 52. 0.100 /media/My Video/[Deleted Items]/webif_autodecrypt/xxx - watch and delete/The Science of Doctor Who_20131114_2100.hmt: Invalid data found when processing input
libpostproc 52. 0.100 / 52. 0.100 /media/My Video/[Deleted Items]/webif_autodecrypt/xxx - watch and delete/The Science of Doctor Who_20131114_2100.hmt: Invalid data found when processing input