This started happening in the later Betas (sorry I couldn't pin the exact one down ~ the betas were coming too fast).
All my songs that have DiscoDSP's Vertigo do this:
If I solo channel 9, I can hear Ch 7 bleed through sorta distorted. Same thing if I solo Ch 7, I can hear Ch 8. Each channel in question has an instance of the Vertigo VST. I tried deleting & re-adding the plug-in...still the same thing. I've already e-mailed the song to the beta e-mail address.