Likely not what you wanted to hear, but How about sending me your BIAB file so I can see if it renders on my system. Before I made this offer I rendered to wav (I don't often use this feature in BAIB) just to be sure and it worked flawlessly. I'm dan - with an at sign - jazzmandan dot com (you get the idea)

Oh and best to move this to its own thread so as not to hyjack the OP. This seperate thread will likely get wheels and role.