Yeah, I am not sure what that function key combination is supposed to do. Anyway, the fact that this particular key combo doesn't work is not a major issue anyway.
The major issue is the fact that I can't alt-shift-tab (without releasing alt) after I've alt-tab'ed, if you understand what I mean. This is pathetic and seriously hampers the experience. Even the 10$ keyboard I used before could do that. I am rather disappointed in spending a considerable sum on a keyboard that, above all else, doesn't perform the most basic functionality I'd expect from a keyboard.