Further; It looks like I can't view or edit any part of the member's profile page either.

This is permission issue. Please edit Usergroups and check if they are allowed to see Members and Member Profiles.

Also if you have other plugin for user profiles like BuddyPress or ultimate Members, make sure they don't use the same /profile/ slug. It may conflict with wpForo.

Thanks.

I'll check those settings. But everything was working fine up until recently. I've not altered any permissions. and I have UM running when I installed Foro and everything worked fine out-of-the-box.

I will check and report back.

thanks for the reply

Well, I've checked the permissions and all looks fine. Note; Even logged in as an admin (with full permissions) I cannot access any of the Foro profile pages, nor can I access my own profile settings like signature etc.

I can't see any other plugin that is conflicting with the profile slug. Although I'm not altogether sure how to check if there is a conflicting page/plugin. Am I looking for PAGES that are also called 'profile'?