Strang behavior here. I was using BuddyPress on 3 sites. On one of them the upgrade to 3.0 ran perfectly. But on the 2 other ones a problem showed up: when you visit some pages you get a 404 error.
- If you deactivate BuddyPress the problem instantly disappear.
- Strangely, if you save again the permalink structure it seems to work OK during a little moment, then the problem gets backs again.
For example : https://rencontre-surdoue.com/adultes-surdoues/chat/
Don’t know if that could be related to this thread? : Oops! That page can’t be found. for all groups activities
Best Regards and keep up the good work! 🙂