I installed the standard RH6.1, and during the install, the installer couldn't find the CD. After ejecting the disk and re-inserting it, it took off. Looking at the install messages, it was trying to mount (sorry, I should have wrote them down), but wouldn't until I ejected the CD. I would consider this a low priority bug, but it's something that's going to confuse the average newbie. If it would help, I can re-install RH and take better notes :)
This issue has been forwarded to a developer for further action.
Have added this to the FAQ database for installation problems.