Dave Smith Instruments SYNTHESIZERS

I'm having this problem with combos on the PEK: normally, I'm able to have
control over any parameter to adjust globally when no parts are selected
simply by grabbing a control (let's say Filter Cutoff) and turning, and it
applies to all parts at once, as noted in the manual. But now (lately more
often) when I do this, it applies to all parts, but refuses to change the
value. What happens as a result is that all parts are affected let's say by
a filter cutoff of 5, but the filter cutoff knob then becomes useless, and
all parts are now stuck at that value. When this happens, every knob also
works the same way, and nothing can be done about it except to reload the
combo. Other combos seem to work fine, so I am thinking there's something
set in some of my combos that isn't in the others, but until I can figure it
out, I am lost. Man, I love the sound of this thing so much, but the bugs
freakin' kill me! I can never work the way I want to - there's always some
workaround, or worse, a dead end in the OS.
I will live, for now, but I am formulating a bug list / wanted features list
to send to Dave in hopes there will someday be a revision past 1.0 for the
PEK. In addition to any possibly helpful responses to my question, feel free
to post what makes you lose it at the PEK, and maybe the users can have an
impact.

Sorry for anyone getting cross-posted on this too.

Thanks,
Mark