Alt-Tab isn't working on 7.3 or 7.4

[utu]

Hi all, Just got around to downloading 7.4 and am encountering problems with using Alt+tab to switch applications.

It worked in 7.2, but not 7.3 or 7.4.

I rely on this a keystroke a lot and it totally bugs me that it doesn't work. Note that I'm using knoppix64 and "no3d" so compiz isn't running.

Greetings, don.
I confirm that for my 64-bit Knoppix 7.4.0, alt-tab works ok with compiz (as a ring-switcher),
but alt-tab doesn't appear to do anything when using no3d cheatcode.