I just upgraded to X2a from X1 a few days ago and I'm getting lots of pops. The pops are not in the recorded material I'm working on which was recently recorded in X1. I'm using the ASIO driver, 24-bit, 64-bit Double Precision checked. Samplng rate is 48000. ASIO latency reported at 6.9 msec. Note that clicking on the "ASIO Panel..." button does not open the control window as expected.

This is the exact set-up I've been using for years with earlier versions of Sonar at 64-bit. 

Hi Hermit

If I do not disable my WLAN card through Device manager, it causes the same thing.

As for the ASIO panel, mine does the same but isnt an issue as far as I can see, Not sure if it sets everything automatically when you initially select ASIO mode or not. I notice thats when I loose the option to go into.

I just make sure what I have Sonar set to matches what I have set in MAudio's control panel

I too have noticed on various versions of SONAR that the button to open the ASIO driver control panel does not work on my setups. I just open it outside of SONAR and make the needed adjustments.

Another thing to watch for is your buffer settings in preferences,

Bump them up and see if it goes away and then work your way back down to a workable level

Ive jumped some of mine to 1024 working back to 512 or 256

If you disable FX (using the global disable button) do the pops go away? While you verified your bit depth, did you check your file render size as well to ensure it is not 32 bit?

I am experienceing the same thing after updating to X2a, I posted: http://forum.cakewalk.com/tm.aspx?m=2743032 a days ago.  Last night I found that if I froze BFD2 it stopped while at 128K buffer size, didn't have to do this previously. As I increase buffer size, the pops and cracks go away, basically the only time I get them is at 128k buffer size. Which is what I track at because there is no latency. So I have been freezing several tracks while tracking, which is inconvenient and didn't have to do that before. Another interesting thing, I restored back to X2 using system restore and the pops and cracks are still there. The only change which was made was the X2a update.  I did go back thru the services and shut off / disabled anything that I thought was not required for the machine to operate. however Windows 7 has so many services, Its hard to determine what is required for the machine to run. side note: I wish there was a version of windows available which is optimized for recording or at least a bare bones version with the most minimal services / apps for a machine to operate. I probably didn't help out any, but just letting you know I am experiencing that same issue.

That was helpful. I increased my playback buffer and I'm only hearing a few pops now and then. Thanks for the responses.

I started getting some crackling after adding Ozone to my master bus. One of two things helped, 1) Increasing my buffer (I was runnung at 128). 2) Disabling Ozone.
 
I know there use to be a lot of info on configuring XP for audio on the internet, has any come across or know where one could info on Window 7 audio configuring?
 
Bob

Yep, It's worse here too.

Well here I am answering my own question
 
Check out this links
 
 http://www.focusrite.com/answerbase/en/article.php?id=1071
 
Bob