Just entered everything in an otherwise blank Movable Type site. There's this most peculiar thing going on with the header if the center column doesn't span the entire screen. Check out http://magog.student.utwente.nl for a test drive. http://magog.student.utwente.nl/style-guide.html is fine, though.

I double-checked the entire templates were in place, I tried fiddling with z-indexes and such but to no avail. Any ideas?