scottfa
Thanks Grim, i was hoping someone could reproduce the crash. I am using Windows 10(1511) and Platinum version 2016.10. Does this differ from your setup?

windows 10 pro 64bit (1511) sonar platinum 2016.12 (or whatever the latest is called) amplitube 4 is the latest version, 4.1 i think it is

I nust say that IK's support has been stellar so far. Got back to me  in a day, followed up with questions and then asked for the Sonar project. I know that this will be a hard  problem  to solve being intermittent and all, but IK is trying. 

I too get random crashes when exiting project where Amplitube 4 is on a track or two and have submitted crash dump file to Cakewalk.  I have had problems running Amplitube 4 Standalone...long story issue realates to sample rates and changing them.  Using Sonar Platinum on Windows 10 with Roland Octa-Capture Audio Interface. Everything else works perfectly on this system...
 

You could always reset and run a fresh scan of your VSTs.  This has cleared up plug problems more than once.

I never though of doing that...thanks Bob
 

I did what you suggested Bob and did a test after...only recreated scenario a few times, but no crash...