For what it's worth, my Hopkinton (W7 64) , which had worked fine for a couple months, suddenly started going straight to hell last week; I renamed aud.ini and since then have had no problems at all.  

davec69
.The problem?  Sonar freezing, and getting stuck with the spinning win 10 mouse icon, which requires a complete re-boot.  Usually occurs when I mouse click somewhere on the screen.  I've waited up to 20 minutes for Sonar to respond, but once it goes, only a complete re-boot will get it back.

Yup I get that I think it's related to the single core issue right now with JP. I cannot possibly 100% confirm this (tried and failed to get a beta patch for cakewalk).

Best thing to do is rollback I suggest. If the next release has issues then I guess we will have to think of something else.

Yup and you could try the AUD.INI thing first.

I recently replaced my old graphic card with an nVidia GeForce 610 graphics card and started getting the random freezes you describe. The standard installation comes with a bunch of software that is totally unnecessary for my purposes; one of the programs being an HD Audio driver.
 
To stop the freezes I had to do a few things:
1) uninstall ALL NVidia software
2) start Windows in SAFE Mode
3) run the NVidia installer from Safe Mode as Administrator - select "clean" and "custom" install and only install the video driver.
4) reboot in Normal mode
5) turn off HD audio from the NVidia control center
6) From Windows Device Manager disable the HD audio built in to the mother board  
7) Reboot
 
I haven't had a random freeze in a couple of weeks - prior to this, I couldn't go for more than 10 minutes without one.
 
Even if you don't have an NVidia card, shutting off all HD audio except for your recording sound device on your DAW computer is recommended.
 
Hope this helps.
 
Unfortunately, I still haven't found a cure for the Sonar Hang on start up - a royal PITA.

TStorms
I recently replaced my old graphic card with an nVidia GeForce 610 graphics card and started getting the random freezes you describe. The standard installation comes with a bunch of software that is totally unnecessary for my purposes; one of the programs being an HD Audio driver.
 
To stop the freezes I had to do a few things:
1) uninstall ALL NVidia software
2) start Windows in SAFE Mode
3) run the NVidia installer from Safe Mode as Administrator - select "clean" and "custom" install and only install the video driver.
4) reboot in Normal mode
5) turn off HD audio from the NVidia control center
6) From Windows Device Manager disable the HD audio built in to the mother board  
7) Reboot
 
I haven't had a random freeze in a couple of weeks - prior to this, I couldn't go for more than 10 minutes without one.
 
Even if you don't have an NVidia card, shutting off all HD audio except for your recording sound device on your DAW computer is recommended.
 
Hope this helps.
 
Unfortunately, I still haven't found a cure for the Sonar Hang on start up - a royal PITA.

 
That's how I do mine. I download the latest driver for this. Safe mode is not required btw it won't make the install any cleaner, and there should be a full uninstall option when you update the driver. You can also disable the HD audio devices in device manager.
 
However it's unlikely to just cause just Sonar to freeze if there is a problem, rather it freezes windows itself and you need to perform a hard reset of your PC.

Doktor Avalanche
 
However it's unlikely to just cause just Sonar to freeze if there is a problem, rather it freezes windows itself and you need to perform a hard reset of your PC.

Yes, the symptoms on my machine were variable. SONAR typically hung first followed by all sorts of nasties. A reboot was always required.

I had, and am still having the same issue.  I installed the Ipswich upgrade and Sonar kept crashing and I would have to reboot.  Once I rolled back to Hopkinton almost everything was working fine.  ( my soft synths still have a tremendous amount of latency, so much so that they are useless).  I tried upgrading to Ipswich again and the same thing happened.  Right now, Hopkinton works so I am leaving it there.  It would be nice to have the new features, but the constant crashing is not worth it.
 
Art