disabled every plugin installed – restarted server (just to be sure)
enabled buddypress; seems all good at first, however; …/activation/ isn’t working.
The user receives activation mail with key (and link), you may click link or enter key manualy – result is the same; reload of page, no message, no record updated in sql db.
This gets real annoying now – enjoy the functionality of buddypress, but this is killign me