Woah. Thought I'd try out the UAS plugin. Dialed up a cool bass patch hit about 6 notes on my MIDI keyboard then, no sound, splat FREEZE, no hope of restarting, have to totally shut down computer and reboot. I've had no problems with the infamous Sonar "unresponsive" crashes that plagued me with X3 since I upgraded to SPLAT until I tried this instrument. I go to task manager and shut down everything (I think) that is related to Sonar, but it will not start again after these crashes and have to reboot. I tried it 3 times, same error every time. Guess I won't be trying that synth again....too bad.

Can you provide some information about your system, e.g. audio interface/sound card, operating system, processor and memory?

I've had the same experience with AAS Player. Maybe you should report this to Cakewalk support team.

I used to have my system info in my profile don't know what happened to it. Win 10 quad core 2.67ghz 8gb ram, Roland Quad capture.

I recently got a new interface, the audient id22, but up till then I was using a quad capture and noticed that things had got a little unstable over the last couple of months. Not sure if the roland drivers are your problem but just giving you my experience.

FWIW - Unless Soundwise is also using a Roland it's probably something eles, but before switching over to the TASCAM interfaces, I was using an Octa-Capture and when running as ASIO, was becoming less reliable with new Windows updates. However, there are situations where I run two interfaces, one ASIO and one Windows drivers, when capturing audio from Hypercam. The Octa-Capture works fine with the Windows drivers. Try running it as WDM and see if that makes it work more reliably.

Anderton
FWIW - Unless Soundwise is also using a Roland it's probably something eles,

No Roland gear here. I use Focusrite and occasionally run Sonar with Windows drivers and built-in audio. Since AAS products are now a big part of SPlat, I hope bakers will do their best to cooperate with AAS developers and fix possible bugs that cause Sonar's crashes and freezes.

I have the same problem with AAS Ultra Analog synth, it crashed Sonar Splat several times.  I'm using RME Babyface with up to date drivers using ASIO.

Thanks for your input everyone. With the plethora of synth options these days, I can live without that one. I haven't reported my pleasure with the drastic reduction of crashes I've had since Splat, because as soon as you report that you've been crash free, you know what happens next. In X3 I spent hours and hours of detective work and support reports and driver updates etc., instead of making music. I now run multiple instances of amp sims and Spectrasonics and BFD among other synths without any issues at all until this one. Maybe they'll come up with a patch or something but until then, I'll move along and make music instead.

Disclaimer: I have no explanation for this and it's weird, but...
 
I had not had issues with the synth before, so I thought I'd see whether I could experience the same problem as y'all. I inserted the synth (MIDI + audio, standard instrument, not simple instrument) and although it didn't crash, it would not respond to MIDI or make any sounds. This meant the only song I could play would be John Cage's 4:33, so I tried replacing UAS2 with SI Bass to see if there was some routing issue or something, but the SI Bass worked fine. Then when I went to replace the SI Bass with UAS2, and SONAR crashed.
 
Out of curiosity I did the "old school" synth insertion method of creating a MIDI track, creating an audio track, and right-clicking in the audio track's FX bin to insert the UAS2.  
 
It worked perfectly...but that's not the weird part. The truly weird part is that when doing exactly what I did before, it now works. Simple Instrument track...works. Regular one...works. Closed project and opened new one...works. Closed SONAR, re-opened...works.
 
I'm really curious whether someone who's having crashing problems and tries the old school insertion technique and then goes for the standard options ends up with the same results I did.