I started this topic from the All Categories screen by clicking on new topic.
If I go into General Discussion or WoW Classic General Discussion I cannot reply to anything, and cannot start a new topic.
But I was able to post this from the All Categories screen, and could have started this in either Classic or General.
Is your account active? I.e does it have game-time?
Yes I just renewed it yesterday.
It was working fine yesterday when my time ran out.
I did a resub for 6 months and now have this issue.
My account also correctly shows my sub is active until May 2020.
Try logging out of the forums, then logging back in.
I tried that yesterday after I had the issue and it didn’t fix it.
But it worked today.
Really weird, thank you kind sir!