Problem found! WooCommerce has an option build in that creates a username automatically using the supplied email address during the checkout. BuddyPress apparently doesn’t accept an emailadres as a username (which makes sense). Now that option is disabled everything is fine again. Thanks!
I just switched to the 2011 theme (or should I use 2012?). Well, no difference. Then I disabled all plugins except buddy press. Still no luck. Then I double-checked the users. Played again with roles (site and forum), but it doesn’t even work when I make my user administrator. Both users are exactly the same (for what I can see) and still the one I created within the Dashboard can be added to a group and the other one not. Same setup on a different domain works flawlessly… 🙁
Any other clues that you can think of? The only thing I didn’t do yet (because I am afraid off possible compatibility problems…) is upgrading my wordpress to 3.6. I did say that I have all the latest versions (in fact I just installed everything new a few weeks ago), but that update 3.6 must have been released very recently while I was on Holiday. Still the other setup has the same WordPress version, so it should work without…
