Well, i guess no one noticed this bug yet... so...
Try doing this:
First, put some icons on your dock.
Then, go on settings, general, and if you set Key Presses/ Mouse Wheel Scrolls Per Rotation to 0,
it will spin forever. Ok, this is normal. But now, if you set it to ANY other number, or if you close your dock, all your icons will... disappear! And, you can't add anything else, only if you replace your System/Settings folder (I did'nt test which .ini archieve must be changed.)
Well, that's it.