bitflipper
The easiest workaround is to start SONAR and close it. For me, at least, the problems do not reoccur after SONAR has been opened once. They reappear after a reboot, however.
It would be nice if Noel would give us a little information, though. I'm sure he already knows what the problem is, but the fix is likely going to be very difficult. I'm also sure he's deep into it and hasn't seen a 40-hour workweek since this all began.
I just observed something odd using ProcessExplorer by Sysinternals, which is related to ProcMon, but is actually a souped up Task Manager.
I was looking at the threads view for the main SONARPLT.EXE after a freash boot-up and first run for Platinum, and I saw threads for each of the project plugins .dll files.
So I closed that project and created a new one. Inserted a few instruments and FX. ProcessExplorer no longer shows any plugin .dll threads in the main Sonar process.
So I re-opened the first project that had shown plugin .dll threads for Sonar. Diito. None shown. Weird ...
Here is a free eBook with Chapter 5 "Processes, Threads, and Jobs" from "Windows Internals", by Mark Russinovich, founder of Sysinternals.
https://live.sysinternals.com/windowsinternals/windowsinternals-ch05.pdf Grab a copy of ProcessExplorer here and follow along, LOL!
https://technet.microsoft.com/en-us/sysinternals/processexplorer.aspx