I assume what is listed in bugzilla as "gpgp" is gnupg, if I'm wrong please tell me where to properly submit this bug. When I run "gpg --gen-key", attempting to enter a user ID fails with the message "Invalid character in name" no matter what I type. Even copying & pasting the example "Heinrich Heine (Der Dichter) <heinrichh>" fails.
The message is a bit ambiguous. GnuPG prompts for the information in three pieces: the real name ("Heinrich Heine"), an email address ("heinrichh"), and a comment ("(Der Dichter)"). If you enter them separately, and you still get this error, please reopen this bug.