I hope these aren't repeats - I searched but came up empty.

1) It seems that users can't change their profile. The error dialog returned states: "All of the required fields are not filled in". Nothing special/obvious was changed in the setup of UBBThreads. What should I look for?

2) One particular user went through proverbial H*#? to get setup. After registering and logging in, he kept getting the message: "You do not have permissions to create a new topic on this forum." His e-mail was from the rediffmail.com domain. Is there a problem with this?

Did you upgrade ubb also.
What version to what version

He's on 7.1.1. the URL is in Rich's profile.

HERE IS a post that may help.
There was a bug around that time that had to do with age restrictions and or birthdays in the profile

Also I did register and you have a blank required field no title but the field is required.
When I try to update my profile I get "is a required field" Thats all I get.
So whatever the field is, somehow it looks like it is required but does not show what it is.
So it could be the bug in the link I posted above. Or you may just need to go through all the profile fields. Toggle them back and forth and submit.
Its possible that section may be corrupted from the move.
The same be true for the not able to post issue. The forum permissions may be corrupted and you may need to go over them and re-submit.

Another thing I noticed is there appears to be a mouseover tool tip feature in the active topics pages that does not display correctly.
I don't recall that feature in your version so it must be a mod that may be causing a problem.

Thanks guys. Sorry for the delayed response, I've been out of town without Internet. I'll check into these ideas today.