With zoom 105%, 120%, 130% the toggle sidebar locks when once opened, with IE9(and also at zoom 70%, 80%, 95%, but this seems not so important). It reopens only if I refresh the page. I have tested up to 250%, it works well at other zoom %. (If a bug, it's of course, very little :-)
With IE 9 in Compatibility Wiew the toggle sidebar closes well at every zoom %, but the beginning of text at the main menu is corrupted with Compatibility View.
(I use Windows Vista Home Basic sp2).
With thanks to the creator of the nice theme,