Problems with ALT+F

[ejunniim]

I have ALT+F bound to an action on my hotbars, yet when I press it, the action is only used if I'm standing still.

Although it's been quite a while, now I'm wondering if you've found a solution to this problem?
Unfortunately the question is relevant to me, as the same thing happened. Would guess that some application in the background is overwriting the combination, or something in the settings of the keyboard itself?..