Hi Richard,
Even though it is noticabley slower than what I have been using, I really like the Krystal theme because of the way it works and the ease of making it look they way I want it to. However, I have noticed a bug with the page-header.
When navigating through my site, everything is fine and the site name and course names show up right next to the logo. When I go to an assignment though, the assignment names are showing up there and due to their length, word wrap makes them run down the left side of the page. It is mostly covered unless you have the left column blocks docked.
My temporary fix has been to just hide it. In pagelayout.css line 230 I have changed the visibility for page-header.headermain to hidden.