Hey, I saw your message here that you are unable to create a new thread in the forums. Are you still having this issue? What happens when you click on the Preview or Post button? Or are the buttons grayed-out (disabled) and it won't let you click on them?
-- if the buttons are grayed-out, make sure you are filling in the body of the message, not just the title part. The buttons are initially grayed-out until you've typed at least 1 letter into the body of the message (to prevent people from posting blank messages on accident or as spam). Here's a picture:
It looks like wiki links work. I think regular talk pages are much better. Toolbar, complex multi-threaded indentation, image sizing and placement is easier, image floats, and much more. Can't illustrate and discuss problems well with this.