Recently I bought a new sound card, namely the Mackie Onyx Blackjack. I have both the 32 and 64 bit versions of Sonar 8.5 Producer edition installed on my laptop (windows 7 64bit). before I got the Blackjack, I had dumped my m-audio FTU and was just using the built in soundcard with ASIO4All, everything was fine. Now that I installed the Blackjack and everything, the audio is EXTREMELY choppy with clicks and pops all over the place in both versions of Sonar.
Outside Sonar, sounds are fine. I've tried all my USB ports, reinstalling the Blackjacks drivers, pretty much everything. Also, at first the audio started chopping up only after the first windows or instant message or whatever sound played, now it just chops up when I start Sonar.

I'm kinda desperate, I have a deadline for some songs and I can't work.

additional info:
my laptop has 6GB RAM and intel core 2 duo processor @2.13Ghz.

Have you gone into the Sonar Audio settings to make sure it's using the new soundcard?
You may want to also try increasing the ASIO latency setting if all you're doing now is mixing.

The ASIO4All may be causing some interference, but I'm less familiar with it than others on the forum.

Along the way you're likely to get some advice that laptops are not the best platform for doing advanced audio work because generally you want 7200 RPM hard drives and a dedicated hard drive for your audio files.   But that sort of advice doesn't help you meet your deadline so let's focus on that.

yes, I've tried messing around with the latency and uninstalled ASIO4All. The only audio drivers Sonar has available are exactly the Blackjacks.

Did you read up here before buying that card?

Mackie aint so good with teir drivers...

unfortunately I didn't hear about that until after the damage was done.

I'd been trying stuff now, it seems to randomly work properly and not.

When recording audio tracks, the tracks shows as shadowed  (Record 1 busy)  but it does not complete the track image.
 
I have been recording many tracks the last 2 months without problems.  Can someone help???
 
Error message 
Application Name:                               SONARPDR.exe
  Application Version:                           17.5.3.282
  Application Timestamp:                     4b7b37d2
  Hang Signature:                                  9bf2
  Hang Type:                                          1
  OS Version:                                          6.1.7601.2.1.0.256.1
  Locale ID:                                             1033
  Additional Hang Signature 1:           9bf2c015a1c34db6dcdc9c5acb6b2654

Start your own thread and list as much info as possible, Your audio interface , OS and version of Sonar. 

The Hang Type could indicate an HDD malfunction. How old is your Hard drive ?