I’m in the same boat. I’m new to P2s and thought i didn’t turn on something at first (configure P2). Not the case!
I’m a Chrome user with the latest version, using a mac or a PC, i cannot post or comment.
Also, and this is a Mac only issue, i can’t scroll to the bottom of the page. If i try to scroll it jumps be back to the top of the page. Seems like a javascript issue although no errors to report.