In the final page of the druid, there's a text saying "You can run the registration program later by typing rhn_register at the command line". However, this causes gtk+ to underline the r since it sees the _r as an accelerator character. The correct fix would be to write rhn__register instead.
This defect is considered SHOULD-FIX for Fairfax.
I think this has been fixed, hasn't it?