I managed to get user profiles and admin editing privileges to work after changed the url style to default instead of post name. But even after setting the user edit post time to 99999 I cannot edit a post as a user. I disabled all plug-in except bbPress and it still would not work.
Oops, forgot to add tags and can’t find a way to edit my post, so hopefully this problem is just me having an oversight. Out of all the forum settings (Edit/Sticky/Merge/Trash/Reply) Edit and Merge will lead to a 404, but the others all work.