problems with posting replys on FS forum

[seboroth]

Hi, i'm having some problems with posting a reply on a for sale forum. I've been trying to do it while logged in and then I tried it not logged in and then I could post. This only happens on the for sale forums, please help as this is very anoying. I managed to send the seller a private message but I would rather post a reply. Thank you for your help.