This is why I've resorted to doing real-time recording of the audio stream using my interface's loopback feature (RME UCX). That way if you are hearing the results you want, you can capture it and monitor for any artifacts, clicks, etc. Time consuming, but it works. (Of course, if you're getting glitches in playback, this won't help.) If your interface doesn't support loopback, I think you can do the same thing with Sonar's patch points. One more thought - Play 5 added new settings for type/speed of drive. You might try adjusting those. Details are on EW's support site. I'm pretty happy with Play 5, until, as I wrote earlier, I hit it real hard and gremlins start appearing out of nowhere.

I've never tried to bounce or freeze Play inside SONAR, but it does Export properly without a single hiccup
 
This is from a 135 track template with drum-mapped keyswitched articulations.

rhenn
One more thought - Play 5 added new settings for type/speed of drive. You might try adjusting those. Details are on EW's support site.

 
On my computer that entire section of the Play settings UI is blank.  There are no options for setting any drives options.  No clue why, though multiple uninstalls and even hand removal of everything from the registry fixed nothing.  So I've just gone back to 4.3.5.  It works, it bounces/freezes even with libraries on slow network drives and realtime playback works too.

msorrels
 So I've just gone back to 4.3.5.  It works, it bounces/freezes even with libraries on slow network drives and realtime playback works too.

Yeah, I may do the same. 

Amicus717

msorrels
 So I've just gone back to 4.3.5.  It works, it bounces/freezes even with libraries on slow network drives and realtime playback works too.

Yeah, I may do the same. 

Was just getting ready to do that when I found this thread.
 
My issue is that I cannot open a project with two frozen instances of PLAY.
 
When I attempt to launch the stand-alone version, nothing happens.
 
So there is definitely an issue with East West Play, as all other synths are working just fine -
including freezing and thawing them...
 
I have a ticket in with East-West/SoundsOnline so hopefully they can shed some light.
 
[EDIT] - 4.3.5 works as expected, and I was able to thaw/un-freeze two instances of PLAY and the associated MIDI files.
 
 

Real time recording of synths, the same way you would record a guitar track or vocal track, has been available for a long time.
Just arm the audio tracks for the synth and then hit R.
It's also musch faster than freezing since it records all 8 or 16 tracks at the same time.

I've found this method (for me) to be better than freezing 100% of the time.