[@finallyfoundausernamenotusedbefore Participant 1 year, 3 months ago]

OK . . . I have had the debugging running and it throws a lot of errors relating to the theme but nothing obvious for the forum. The email tracking has produced no results to date.

With more research the issue seems to have been caused by the BBP Private Groups plugin, which I had disabled as I no longer wish to use it. I re-enabled it and everything then displayed correctly, I disabled it again and everything still seems to work correctly but the plugin seems to still be active!

Therefore it would seem the problem related to that plugin not disabling as it should the first time, and not specifically the BBP upgrade.

I have left the debugging active at the moment, but would like to remove it soon as it is a bit unsightly for users.

Best regards,

John