BuddyPress.org

I’ve been successfully running BP and the forum plugin for several years now.
I did not add any new plugins but of course have been installing updates as they come up.
Sometime in the past month I lost the ability to create a new topic on my forum. The forums are not super busy but I post a monthly contest thread so I know it worked fine a month ago.

No error is generated, the page just reloads. I’ve tried clearing my browser cache in Chrome. I tried using Edge. I went to an entirely different computer from which I’ve never access the site and tried from there using IE. Same result.

I’ve switched to default theme 2015 and I am able to post but I can’t go back and edit or update the post. I also can not reply to the post using the 2015 theme. I am attempting to contact the theme creator for support but there is still some issue with the default theme so I’m asking here too.

Is there some place I can see what plugins were last updated so I can try disabling them?

I’m on my own domain, multi site install.
Apache Version 2.2.31
PHP Version 5.4.45
MySQL Version 10.1.22-MariaDB-cll-lve
bbPress 2.5.12-6148
Wordpress 4.8