Cannot post to classifieds.

For some reason I cannot post ads in the buy/sell/trade forum. I don't believe I did anything to piss anybody off but who knows? I've sold things before and had a slight shipping mishap where the item got sent back to my previous address but the item eventually made it to the buyer. Can anybody shed any light as to why I can't post in buy/sell/trade? I have a few items to sell because I sold my Frontier.