Hi Brian,
 
Well, interestingly enough, I cannot make your scenario happen on my end. Nothing stops sending signal...the reverb and the 1176 continues to send both through my tracks and the bus. I decided to add another audio track with a pro verb and an 1176 after it....both audio tracks worked....the one you made me create, the one I created and the bus with the 1176 and the Realverb was still in tact and sending signal with tails after playback stopped. So I'm stumped as far as that goes brother.
 
I am seeing the FX chain issue in pro channel that Mel mentioned to the T. Thankfully I don't use FX chains in PC but I do use them in my FX bins and they work perfectly for me.
 
-Danny

do you have "Always stream audio through FX" checked?
 

also, it doesn't disable the aux send all the time - have you tried adding the 1176 several times?

(This may be related)
 
IIRC, UAD had suggested to me to (about 6 months ago) to *re-enable* UAD-2 Quad in Windows Device Manager
 
Re-enabling the UAD device did help for a period of time (or 2).

I always have "stream" checked, hence why I can hear effects tails after playback. I never turn that off.
 
Yes, I used multiple instances of the 1176 for the tests for you though it is not my weapon of choice for my stuff. I currently have a project open right now with 7 vocal tracks that have a 33609 and a NEVE 1081 on each track. I have a drum bus with a Fairchild and an instance of dream verb following it, I have a guitar room bus with an 1176SE with RealVerb, a few instances of Helios on a few tracks, an LA2A on my snare and a Fatso on my 2-bus. No issues at all with that line-up. That may not do anything to help you in your situation, but I'm using quite a few UAD plugs in X3 and there are no issues at all. I brought up the plugs while playing the tracks to make sure they were actually doing something and they are working fine for me.
 
I'm not using Sonar x64. Not sure if that has anything to do with anything....I do have 64 and use it on occasion but have had too many issues and anomalies while using it, so I stick with 32 bit without any problems EVER. I have since switched over to all 64 bit plugs when using Sonar 64, but haven't spent much time with it to see if that was my problem. Anyway, sorry I couldn't be more helpful.
 
For what it's worth, all my recording pc's are i7's with 16 gig of RAM, 3 hard drives....one for OS, one for streaming audio, one for samples. We have at least one UAD-2 quad in each box with one that has 2 quads. I run my studio using these pc's roughly 15 hours per day give or take...never any problems (thank God) other than pilot error. :)
 
-Danny

interesting.  If you get a chance to do the same test in Sonar x64, that'd be great.  I will see about testing in 32bit.  I'm using a similar PC - i7, 16 gigs ram, a very robust system - though I only have a couple of Solo cards.  The big difference at the moment that I see is the 32/64 bit thing - I will try to see if that's part of the culprit. 
 
I assume you're using ASIO - what interface?  Anything else that might have an influence?  I've tested at 1024 and 256 buffer settings...
 
Thanks for taking the time to test it. 
 
 
edit - ugh, testing 32 bit Sonar would require me to install it on this machine.  I don't think I can risk having two Sonar X3 installs - too much potential for them to get their streams crossed....
 
Hopefully you, Danny, or someone else can take a look at Sonar in 32 and 64 bit modes and see if this is a 64 bit thing.  At least one other person confirmed it, so I know I'm not completely alone here...

64-bit Sonar here Brian. I'm also on a robust system: intel 4930K, 32GB RAM, 2 UAD2-Duo cards, RME HDSPe MADI fx card. I don't have 32-bit installed and I'm a bit afraid to try....
 
 
Dean

brian brock
edit - ugh, testing 32 bit Sonar would require me to install it on this machine.  I don't think I can risk having two Sonar X3 installs - too much potential for them to get their streams crossed....

A lot of folks have both the 32-bit and 64-bit versions of SONAR loaded on the same machine without issues. Bob Bone has his set up this way, I believe, and many do this so they can stay with 32-bit plug-ins that they prefer without potential conflicts as Danny alluded to above.

well it's good to know that it's not problematic if I have to go that route....
 
So far, 2 64 bit installs have the problem and 1 32 bit install doesn't - would be great to hear from other people as well.

In Sonar X2, the problem doesn't happen, but I am reminded that in Sonar X2 the audio engine is generally more glitchy - I think that in moving to X3 Cakewalk changed how it deals with latency-inducing plugins on the fly.  What I hear in X2 is a kind of hiccup right before playback starts (using the same scenario as outlined above).  This hiccup is absent in X3, when it works. 
 
Again, this seems to be an issue with delay compensation to me...  "Always stream audio through FX" might be making X3 try to compensate for added plugins on the fly, causing it to disable and then (only sometimes in my case) re-enable each plugin, perhaps?