Mackie MCU Pro is crashing repeatedly when I am adjusting parameters on Sonar's imbedded plugins such as the 76 comp the 4K and EQ.  All other funtions of the controller seem to be ok.  any ideas out there in forum land?

Which version of MackieControl are you using? Delivered with Sonar, Cakewalk GitHub or my moded from GitHub?
 
I had several crashed during my test with (moded by me ) MackieControl, at the end erroneously coming from Sonar callbacks  from my (AZCtrl) plug-in. And I was wondering why I never had it with just my controller alone. That is why I am interested.

Same issue here when using the compressor button on the MCU. Sonar goes down! Everything else seems to work well.  I have a new Mackie MCU Pro with the latest firmware. 4.0.3 I believe.

Any progress in regards to sorting this out?

Excuse me for repeating the question... Which Sonar version and which MackieControl.dll incarnation are you using?