Pip Radish posted about a problem registering at the fRoots board:

"Pip, you may have been banish-ed for ever when Ian accidentally removed ALL his AOL posters

Possible, except that I don't use an AOL address. I've tried registering with two different GMail addresses & been told they were both bannèd. Which was odd."

I know at one time gmail addresses were banned due to a problem with spam accounts. That might be the reason you could not register