Did this get resolved? I'm still in a holding pattern.
Well, we did hear back from them, and unfortunately, the new build didn't work for them either. BUT I finally found someone at Eventide at the end of last week who has a Mac with Yosemite on it that shows this problem. I did some testing last week and narrowed down the source of the problem, and I think I'm going to be able to figure this out and solve the problem this coming week. I'll post back here when there are new builds.