Assuming there's not too much customizing of vbulletin-chrome in your theme, just revert it to default, and then in additional.css add some padding or margin or whatever. It's a really simple thing to fix, like adding
Code:
.forumhead h2 a {margin-left:30px!important;}
to additional.css or whatever. currently it looks like your theme is using "text-indent" to accomplish that, I'm not sure why it would stop working for 4.2.1 honestly, but of all the problems you could have it's pretty minor.
Thanks for taking the time to look into this, I think I have it sorted now