Please let me know if it works. I myself need to create a new post but I can't, and as far as I read the recent posts in this forum, we two are definitely not the only ones with this problem!

Hi Matthias,

thanks for the response. But to make things clear:
ROBAX and I are encountering this problem in THIS forum, here on www.dotnetnuke.com, not in our own DNN installations! So if it's a problem with the forum module's settings, as you said, could s.b. from the project team please check the settings of THIS forum? Or who is able to fix this issue? As ROBAX said, a mail to webmaster@dotnetnuke.com didn't help.

Another user with same problem here on www.dotnotnuke.com forums is rudr in thread "Dotnetnuke.com Forum Issues/Questions"

As only some users seem to be affected, it's perhaps s.th. with our user accounts?

Add my name to the list - both lists.  I have the same issue (error creating new threads, but can reply to posts) and sent email to DNN.  I created a new account and can start threads, so it's a user account thing, I assume.