UBB.threads PHP Forum Software Community Forums UBB.threads 7 Bug Reports UBB.threads 7.5.7: scripts/adduser.inc.php gives error while registering a new user

Here are the details:

Version of ubb? 7.5.7
Version of php? 5.4.8
Global Server settings? What are these?
Using mod security? No
New install of ubb? No
Or upgraded ubb version? No
What else changed? Nothing
URL to site? http://wordsmith.org/board