its probably an attribute of that particular theme
unless you know how to modify themes... not much
There are many themes out there that look like OSX
just find another one that doesn't mess with your fonts
deviantart has some nice themeshttp://browse.deviantart.com/customization/skins/vistautil/#catpath=customization/skins/vistautil/visstyles&order=9
Agree. These themes you pick up from third parties often have odd things about them. Almost every one of the Stardock window blinds themes will have some annoying feature and unless you can get into the config files and modify them I doubt there is anything you can do about it. The Stardock OS X theme does not have this problem on my system, if you want to try that one.