An update:
I think I have figured out what is happening when some MSM controls stop responding.
I'll skip the gory technical details other than to say that the background task that MSM is using to drive those screen controls is getting killed/hung.
All the controls impacted are things that were designed to be inside mach for V4, but I had to fake them on V3 - hence the background task that updates a bunch of User DROS and LEDs (this makes the V4 controls work on V3). When the task stops running, the controls stop getting updated.
I've contacted Brain to confirm the theory as to why this happens... I suspect it will take an update to Mach to cure this one.
Right now, I'm planning to hold the next beta release until we can sort this out.
I'll let ya know more then I can.
Dave