Hi Arthur -
The issue looks to have been backlogged for the time being, because the workaround is a fairly simple one of adjust two attributes of a generated material.
For your particular model all you would need to do is open the few materials which need to be Translucent and set them to translucent and plug in a Constant value of 0.1 into the Opacity Input.
Please know we still have a fix on the radar, but it will be sometime before we can address this issue directly.
Thank You
Eric Ketchum