I don’t know if this will help, but it was something I forgot about and it fixed most of my issues which were similar:
“sounds like you enabled BP from the upgrade screen. Disable BuddyPress, then go back to the plugins page and re-enable it sitewide (over on the right it says ‘Activate Site Wide’). That should fix many of your issues, but not the blog lists one. Working on a fix for that now.” from shawnkhall on this thread.