I believe I have found a bug in the theme "Flames of Simplicity"
While using said theme, If you click on "Choose Forum Style" under user cp, the page does not load. no error, just blank. It seems the server returns blank HTML page. The page has the head and body tags, but nothing is in them. The URL of the link clicked http://www.pokecommunity.com/profile.php?do=styles
Source code of blank page:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<META http-equiv="Content-Type" content="text/html; charset=utf-8"></HEAD>
I found the problem, it seems the url from the theme is: /profile.php?do=styles
The correct, working url is /misc.php?do=styleselector
FoS is not the only theme with this problem (at least on my end) 'Generation InVerse' seems to have the same link issue.
That's odd, the Master Style should contain all those variables within the UCP template. I guess it could be possible that the changes weren't applied to any themes with an edited UCP template, although I can't spot any changes made to that of FoS. Odd.