We've looked into this, and the only wrong thing we can see is when you are on the LEVELS page, and use [DSP A/B] to go between A and B. If this is what you are doing, try using the <dsp A> and <dsp B> softkeys instead.
If this is not the issue, it would be helpful to have a key by key description of what you are doing so that we can duplicate it – there are often many ways to do something and if what we do works and what you do does not, it is hard for us to help.
In particular, if you use the the A/B key as described above, the unit can crash if you press and hold the [SELECT] key – this is already fixed for the next version.
