I'm trying to create a new user group. In the web client I go to Setup > System Administration > User Groups, and I see my 47 existing user groups. (I've done this a few times before :-)) At the bottom of the page, I click "New User Group", and I get a blank white page with a spinning gray progress circle -- 15 minutes later, it's still spinning.
Everything else I've tried is working fine. This is PRTG 220.127.116.1106, but I got the same results with the earlier 13.3.5. (I did the upgrade to see if it would fix this. It didn't). I've restarted the PRTG service, rebooted the PRTG server, but still no luck.