For some reason I can't sell items to sign shop in smp1, rightclicking on the sign doesn't do anything This only happen on smp1, other servers work just fine. UPDATE: For some reason it works fine now, is this a random server issue?
I don't really think it's a bug... It's like trying to place a block where you're standing - it's impossible. This is the same with shop signs.
If you mean the /shop, you cannot sell items to it. It is intentional. And, if you don't see an S on the 3rd line, the shop owner doesn't let you sell.,