Certain members unable to post - Ver 3.8.2
 

Some members on my forum are suddenly unable to post on the forum. I've tried changing their user-groups to others but to no avail. People from within the same user-group can post, but they can't?

I've tried using their accounts on my own computer, and it's the same problem. So it's not relevant to a single computer. Whenever 'post reply' button is clicked, nothing happens, even in the advanced mode.

Any help?