[Dave Clarke]

I uninstalled iLok and PT completely, then reinstalled up to 9.05.

Things were even worse - now PT would exit silently after a few seconds without even an error message.

I decided to try 9.06 update. I also cleaned up the start up and services (I have a separate user for ProTools with Admin privileges with optimized configuration per PT recommendations).

I found what appeared to be a duplicate but identical entries in the registry for Avid MME. So I disabled one of these.

And now it works!