Make sure the Quad Capture is not plugged into a USB hub. It should be plugged into a USB Port on the computer or a powered hub, but not a unpowered hub.    

Also, the instructions are very specific that the Quad-Capture must not be connected to the computer when installing the drivers. Most USB equipment is like that. If you didn't install it properly, then uninstall it, then re-install it following the instructions in the manual carefully. 

What other equipment are you using, specifically do you have any other USB devices like a USB microphone or other audio device that could be interfering with the Quad-Capture?

optimus


Spoke too soon.
The problem is back and disconnecting and reconnecting the Quad Capture while Sonar is open isn't the solution.

Bob, the sample rate in Sonar is the same 48000Hz. The 24 bit depth is greyed out and can't be changed.

The weird thing is, recent projects play ok. It's the old ones that don't, though they were tracked using the same computer, device, and Sonar.

The Quad Capture plays back the test file included with it without problems.

The bit-rate you are looking at is NOT the one I referred to in my instructions as to where to change it.  Please review my earlier post.  Bit rate show in one place as grayed out, but to change it you must go to Preferences>File>Audio Data.  That is not your issue with these projects, but is nonetheless how you change the bit-depth for recording in Sonar.

Why don't you try using a Sample Rate of 4.1?  Just as a test.

Bob Bone

also,make sure you plug this device in to the same port all the time, don't go using different usb ports every time.
plug it in the same port you installed the drivers to, this is important.

I have gotten that message when there was a clock rate difference. 
I have a few older projects that where recorded at 48, when I open them I get that message. I had to go to my interface control panel and change the clock rate. In your case I would try this with 44.1. 

Thanks guys. Iwill try and work through the suggestions.
Cheers

if these ideas don't help optimus you may be at the end of your rope and tech support is always another option.

Well, I did go to Cakewalk support at the same time I came here, but knowing that they take ages I thought I'd try you guys as well. CW support has responded, but not really helpful.

In the meantime tried all sorts of things as recommended by you guys and I have things working, although I'm not sure how or why. The main thing is that I have salvaged the older projects and things seem stable for now. I have resaved everything to the current settings that work, so fingers crossed. 

Cheers