you are saying the crashes started to happen after you installed the Pro channel pack, which you previously did not own, but before X3c did not crash?
 
so my assumption is that the provided pro channel pack may actually not contain the latest version of those DLLs.
 
i had a similar problem (yet no crashes) when installing the VS-700 part of the X3 installer package, which afterwards caused problems that had been there but fixed a year earlier by a V-system update that apparently did not get updated in the Sonar installer package (i.e. it was installing something older)
 
Try re-installing X3 so that it replaces those prochannel DLLs ... see if that fixes it ...
 
 

ok. yes disabled 64 bit precision(its Always off)
 
1. Normal template using 2 monitors
-0 tracks and no new bus.
-Only adding the 4k Channel compressor to the master.
Seems stable.
2.Same Normal template using 2 monitors
-Created 1 blank audio track (and no additional fx)
-4k channel compressor is still on the master.
CRASH!
 
 
 

And the update. When doing the same as above on 1 monitor there are NO problems.

yes, freeflybert, I was running sonar X3C very stable without any problems. Purchased the prochannel pack 2 days ago, adding the modules to projects and the crashes started. I did install the 1.01 version from the cakewalk site.
 
So the NEW prochannel modules (4K channel and 4K gate) seems to be the problem. Also in the crash log if will mention those 2 modules. Concrete limiter and 2a look ok. 
 
 

FreeFlyBertl
you are saying the crashes started to happen after you installed the Pro channel pack, which you previously did not own, but before X3c did not crash?
 
so my assumption is that the provided pro channel pack may actually not contain the latest version of those DLLs.
 
i had a similar problem (yet no crashes) when installing the VS-700 part of the X3 installer package, which afterwards caused problems that had been there but fixed a year earlier by a V-system update that apparently did not get updated in the Sonar installer package (i.e. it was installing something older)
 
Try re-installing X3 so that it replaces those prochannel DLLs ... see if that fixes it ...
 
 

The Pro Channel modules are extra cost items that the OP is talking about. I could be wrong but I don't believe X3 comes with the add on PC modules. I don't see how reinstalling X3 will do anything. 

John

The Pro Channel modules are extra cost items that the OP is talking about. I could be wrong but I don't believe X3 comes with the add on PC modules. I don't see how reinstalling X3 will do anything. 

John, you're probably right - i had a look and none of the additional PC modules were updated since it's original installation, apart from the PCS-GlossEQM.dll (is this the PC EQ?) which got updated with X3c (29/10/2013) ... so checking that file date would be quick and easy

ok, i did some further testing. Even on the main screen the console will crash Sonar. It looks like when the console is UNDOCKED it will crash. Also using the main screen only. When its docked on the main screen there is no problem.
So it has to be something with the prochannel modules pack (4k channel/4k Gate) and the floating console.

Another thing I found.
Left screen i have track view. Right screen I have floating prochannel inspector AND floating console. No problems.
Left screen track view + floating prochannel inspector. Right screen floating console. No problems.
 
So inspector and Console both need to be undocked or both floating. Otherwise crash when touching faders. It does not matter if they are or monitor 1 or 2. It will Always crash when console is floating and inspector is docked.

Oooof... I did have a similar repeatable crash in X2 when the console was on the second monitor.
 
I have not seen this recur in X3 (yet) though, but that sounds a lot like what I saw in X2. Whenever I undocked the console (in X2) and threw it onto another monitor was fine until the moment I adjusted things. Then it would crash X2, and was very repeatable.
 
Edit: I just followed the steps you explained and cannot repeat the crash. Then I took a project from ages ago and started throwing the 4K PC modules onto the master bus while it was playing back and still no issues. I basically have the TV and main program on monitor 1, and the console view on monitor 2. I saw what you are describing in X2, but it "went away" for me with X3.

Maybe problems with your memory of the video card or maybe some tweaking has to be done with the card?