Ok, I got one! (lol)
I just uploaded and installed 7.07 on my server. During the setup process, I successfully set my username as
Master Blaster (note the space)
Now, I go into my profile to complete it and it won't let me save my profile. I keep getting the error message that only letters _ & - are allowed, no spaces.
Can I just go into the block and change the restrictions or are there other reasons there are no spaces allowed in the names?
I'm calling this a bug because if the system doesn't allow spaces, then the initial setup screen that does allow it needs to be fixed.