Change all your user's slug in "/firstname-lastname/" (lowercase) format.
I tried this plugin because after importing users from a different bulletin board into my bbPress/BuddyPress site, all of the users who had spaces in their names would get 404 errors on their profiles.
Even though after running this plugin returned a result that made it seem like it didn't do anything, it actually did fix the slugs which fixed the 404 errors.
For that alone, awesome.
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