On the board I am managing, [url]hhtps://www.dfac.dk/fritforum
[/url], the notification settings page in UCP gives the HTTP 500 error. We have recently updated to php 7.0, phpBB 3.2.1 and implemented SSL. When the error has arrisen I do not know. It was just observed by a user yesterday.
To me it sounds like a glitch in the code, which has not been touched.