@techguy: Thanks for your link. I first tried the entry “preg_match( “/[a-zA-Z0-9]+/”, $user_name, $maybe );” in the file bp-core-signup.php, but it did not work. Then I opened the file functions.php! The content of the file was only:
So I tried to delete this and replace with code of r-a-y, but the effect was that the code was shown over the header graphic. Then I tried to enter the code before the closing “?>”, but I get the same message, that only lowercase letters are allowed. I am using the plugin “bp-xtra-signup”. Is that plugin the problem or am I doing something wrong?
