Deafening Digital Noise After Mixdown of a 5.1 Bus

I'm having some issues that have just cropped up when I try to 'multitrack mixdown' a bus from my film project. This .sesx session originally was imported from a Premiere project. The project is about 90mins in length and I am trying to export multiple 5.1 stems from each 5.1 bus in my project (SFX, VO, Music, etc). I am using the 24bit/48kHz wav format in the export settings.
This worked fine before but has just now resulted in files that consist of crazy 0dBFS digital noise in 2 of the resulting mixdown stems. It started happening after implementing a music ducker that is triggered from the dialogue/VO track... not sure if that would trigger this result or not. Has anyone run into this sort of thing? If so, I'd love to hear the fix!
Thanks!
I'm running Adobe Audition CC on OSX 10.7.5 on a MacPro 1,1

OK, I disabled and removed the effect I had added and got the same result. I chose 3 busses to export as pictured below:
and here's a shot of the waveform - zoomed in. Thats the shrieking noise I mentioned in the OP. Thanks for the quick response! Hopefully we can sort this somehow.

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