I got a bit anxious about my own PCB order after reading your post, but I finally received the boards today (ordered January 20th) and they seem to be all fine. I had sent the 7 files (G[TB][LSO] + TXT, generated using the Seeed .cam file) in a zip file, sounds pretty much like what you did.
Can you attach the exact file that you sent to Seeed, so that we can check it?