[TWTCommish]

Actually, it's not the "wrong" variable -- it's designed to take on the table head color, rather than the category color. If you want to change that, though, find all instances of this...

{ tableheadbgcolor }

in your forumhome_shoutbox template...and replace them with this...

{ categorybackcolor }

...then, replace the instances of this...

{ tableheadtextcolor }

...with this...

{ categoryfontcolor }

Of course, remove the spaces.