A few months later, the problem is still there. Current version is 2.06-5. The repeating keys for USB keybords make grub completely impossible to use. Some new checks starting with using 'c' as the first keystroke showed that the repetition is random. Some time I get 10 characters repeated, sometimes I get more than 80 characters filling one line and an half on the screen.
This is really a serious problem, please consider looking at it. Luc