ZXbox (ZX spectrum emu) - doubled keypresses

[cougarten]

Hi,
After I found out how to run games (turbo mode + play tape + snapshots + 48k only (I might add all that to the wiki when I have the time)) I ran into the following problems:

In some menus of the games everything seem fine in others it's like this:
All keypresses (or at least the directional ones) are executed twice. Like that I keep skipping one menu item I cannot reach and such :-/
It does not matter if I map to keys or use the kempston emu.
My Device is a cowon D2 (has a touchscreen).

another problem is the speed: 200% is just to fast

thx for your help,
Qgarden