I had a look through the directory, and none of the files seem malformed (to my untrained eye). I grepped for 'NOTIFICATION_GENERIC' and two files have it - one is for a missed call, one for a download, but they both seem to have the correct contents (including named actions and bodies). I grepped for 'Action' just in case, but none have it. I'm guessing those files are transient, and got killed by me rebooting?

None of them are especially private, so I can email them to you if it helps... but fingers crossed, maybe it was just one of those gremlins that goes away when you reboot.