Roundcube Database Error Issue

I'm completely new to RoundCube, in fact I didn't even know it came installed with cPanel. But one of my customers noticed, started to use it, and something broke it. I'm now getting a "Database Error:: Connection Refused" error when you try to connect to it.

I've tried looking for some help, I've edited main.inc.php and made sure that the MySQL credentials were straight, I've checked the MySQL database to make sure the user and tables exist, and I've also tried to force a cPanel upgrade with /scripts/upcp --force ... all to no avail.

I'm stumped, my client is frustrated, I need some help ASAP!
WHM 11.23.2 cPanel 11.23.4-S26138
REDHAT Enterprise 5.2 i686 on standard - WHM X v3.1.0

Any and all help is appreciated!

 

RESOLVED: The problem was that when I set a MySQL root password, cPanel allowed me to create one with special characters. Apparently this doesn't work well for a lot of applications that depend on MySQL. cPanel should probably not allow me to create MySQL root passwords with special characters, and/or check the entry field for that section and warn me of invalid characters.