well that depends.. what "other" posts are you trying to reply to, and where are they located? some places you cannot post, like another person's for sale post. if a moderator locked a thread, you can't reply to that either..sorry i could find where to post this,dose any one on here know why i can reply to some post but not others.its getting to be a bit much......
you cannot reply to For sale/trade posts directly, you have to PM that person.i was just trying to reply to a f/s post to ask a question