I get this message frequently when attempting to save my projects (not Save As):

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Error - Unhandled Exception
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A fatal error has occurred.

Module:  C:\Program Files\Cakewalk\SONAR 8.5 Producer\SONARPDR.exe

A crash dump file has been created here:
C:\Users\Sean\AppData\Roaming\Cakewalk\SONAR 8.5 Producer\MiniDumps\The Leaving2_12212009_172247.dmp
    
Exception code:  c0000005
Address:  00000001408808CC:0000000000000104:0000000000001000    

As a result of this error SONAR is about to exit abnormally.
Should SONAR attempt to save a recovery copy of your work?
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Yes   No  
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Is there any way to fix this error and is anyone else getting this?

This type of error/exception  (c0000005)  is 'usually' access oriented indicating that two or more things are trying to write to the same memory space. We got this a lot when we updated our video card here at the studio. A current driver download helped but did not completely solve the problem untill we moved the Audio Card Interface off the same IRQ as our Video Card. We are using a seperate firewire adaptor and the PCIe slot it was on was sharing and IRQ with the video.
Go to /control panel/system/hardware tab/ device manager/view/choose resources by type/choose 'interupt request (IRQ)
This will show all of your avaliable IRQ's and the hardware and software that is using each one. Try to get your audio interface off any other IRQ's if possible by moving them to another PCI/PCIe slot if avaliable or ( if its a USB interface ) by moving the interface to another USB port and shutting down ( disable ) unused ones.
Of course this may not be your problem either, but its a good place to start...YMMV

Steve H.
http://www.featherlightstudio.com

Featherlight
This type of error/exception  (c0000005)  is 'usually' access oriented indicating that two or more things are trying to write to the same memory space. We got this a lot when we updated our video card here at the studio. A current driver download helped but did not completely solve the problem untill we moved the Audio Card Interface off the same IRQ as our Video Card. We are using a seperate firewire adaptor and the PCIe slot it was on was sharing and IRQ with the video.
Go to /control panel/system/hardware tab/ device manager/view/choose resources by type/choose 'interupt request (IRQ)
This will show all of your avaliable IRQ's and the hardware and software that is using each one. Try to get your audio interface off any other IRQ's if possible by moving them to another PCI/PCIe slot if avaliable or ( if its a USB interface ) by moving the interface to another USB port and shutting down ( disable ) unused ones.
Of course this may not be your problem either, but its a good place to start...YMMV

Steve H.
http://www.featherlightstudio.com

This is an old thread, but I wanted to say THANK YOU! I was having this problem with Sonar Pro crashing over and over again, I sent multiple error reports after each crash to tech support and couldn't resolve the issue. I use a Toneport KB37 USB device to record with, when I connected the device to a different USB port following your advice in this thread, after a day of recording with zero problems this seems to have solved my issue with Sonar Pro crashing.  
 
Like I said, I know this is an old thread, but I thought I would bring this up and mention it for those who might be having a similar problem and perhaps it might help them also. 
 
Thanks again!
 

Sorry, wrong thread