The print image on the main navigation bar is corrupted, i see half of 2 and a bit traffic lights and 2 printers instead of what should be displayed. Just an idea to look into this at some point.
what skin are you using? classic, modern, or something else?
and aslo which build ? can you attach a screenshot ?
please switch to modern, restart, switch back to classic and it should work again *** This bug has been marked as a duplicate of 101968 ***