Couldn't Share, Lost Pumpkin
Spent a half-hour making a great looking pumpkin, tried to share it, but only got denied. It made two beeping noises after trying to "Communicate" for a few seconds, and it seemingly didn't work.
I tried about 10 different names, all to no avail. Eventually I tried to read the reviews to see if anyone else had the problem, but I left the page and lost my pumpkin.
Only realized about 10 minutes after closing the window in complete frustration that I needed to be logged-in. All could've been avoided if it simply said "Please login" or something. :(
Great game, but seriously frustrating when I sat there trying to share my creation for 5 minutes with no given reason for why I was getting denied.