No, I have not = pretty shoddy way to run a contest, if you ask me.
Just wanted to let you know I never heard back from Groundspeak either but decided to go ahead and try sending my picture in with the TB number it said it would not take and it ended up taking the photo afterall and I got it entered right before the deadline for the November Jeep running. So...give it a try and ignore the message you are getting. Hopefully it will work for you too!