So the files are zero-length?
If they're decent-sized files (several MB), I bet they're just missing the metadata for jpg, which any photo recovery app (take your pic, there are about a zillion free ones, and varying paid ones with more features) will fix.
If they're zero-length, that's another issue, I'd definitely try taking some pics, make sure your photo destination (SD card maybe?) has space, etc, so you don't get zinged again.
I took a slew of pics yesterday at my MIL's BDay party, and have taken quite a few others to-date, maybe 4-500; so far I haven't had an issue, other than USB slowness on .218 (different issue, different thread). I have all mine going to my SD card, for reference.