Clicks with Revalver Mk III plug in while mixing

[Spiralsurfer]

I have a project where all of the guitars come in at once and all 4 guitar tracks are using Revalver mk III. Just before the guitars come in there's a small click or pop, is there any way around this or has anyone else experienced this? The noise is there even when I do an offline bounce, freeze the track, or bounce the track in place. I substituted NI's Guitar Rig 4 and the noise disappeared, so it appears to be a Logic/Revalver combination problem.

 

Any ideas? Is it a buffer clearing problem? It happens even when mixing at an I/O buffer setting of 1024 samples.