Distributed rendering problem of bongo 2.0

I am using the latest Vray and Bongo to run the distributed rendering. But it only works well for every other frame. The first rendering starts normal, but the second one is rendered with host only, and the third one runs normal again, and so on. Any idea about how to fix this problem?

I found a similar question from last year: http://bongo.rhino3d.com/forum/topic/show?id=6295899%3ATopic%3A27446. I am wondering if it is resolved yet.