I see nothing unusual or different about your forum settings than any other registered user. Obviously, you can post since you have been doing so in this thread. The status at the bottom of the screen about "You may not post replies", etc., doesn't make sense because it appears that you can.
It is possible that with the forum transition, something got dropped in your account, but I don't see it. I hate to sound like a broken record, but I don't know what is wrong and your best bet is to call the office and ask for Jeff.
As for the Flea Market, I think everyone is having problems there. Ads can be placed, but when viewing an ad, no details or contact information shows up when you click on something. So, that is a common problem for everyone.