New problem - bad cracks during playback

I'm getting back cracks and crackling during playback despite the fact that there is no obvious cause. The cracks happen when I use any effect (though my gut feeling tells me this isn't the underlying problem). I'm using UAD vst plugins but and Adobe effects but I am no where near being maxxed out, only using around 50-60% of my vst power. The cracks happen even when I use Audition's Studio Reverb or graphic eq.only, no vst.
It sounds like a latency type of cracking or the type of cracking that happens when my plugins are maxxed out (nearly 100% on my meter) but as I said, that's not it (although it goes away when I remove all effects, even Audition effects).
The strange thing is I am only working with 3 tracks!!!...2 guitars and vocal. I have many sessions with full band, easily 2 dozen tracks and not had this problem before. But with only 3 tracks...something is screwy.
When I change the latency the cracking gets worse (currently it's at 1.5 seconds).
Any ideas on how I can troubleshoot this??? My software is up to date and my system is virus checked. I'm also an experienced Audition user (years).
Thanks for any ideas.

Hey guys, my audio computer just developed this crackling on playback about 2 weeks ago.
On mastered out audio files, the crackle is not there, but on playback on new projects (started over the last 2 weeks) there is crackle in the playback on all tracks (I get crackling on playback on my speakers and on my headphones).  Even individually, if I mute certain tracks.
I found some weird points when playing with new projects:
-I shut down the computer, and started Audition 2.0 again.  I started a new project @ 48000 Htz and 32 bit sampling.  And there was NO CRACKLING on playback (on speakers, on headphones, on mastered test audio files)
-I went back to my problem projects with crackling playback and, yup, my playback had crackling on them
-I mastered out my origional raw audio tracks (from the crackling project timeline) and put them on my new project timeline, and NO CRACKLING DURING PLAYBACK.... hmmmmmmm.
I have no idea why it's doing this.
But if your project is having playback issues.  Try a full shutdown/reboot, open a new project and do a test record to see if there is crackle.  If no crackle on playback, then go back to your crackling project and master out and re-import your raw audio tracks to your new project timeline
If you guys have found another work-around, or a complete fix, post up and lemme know.

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