It has a PRT surface object that feeds a FieldMagma, but after they connect the viewport doesn’t update properly any more. Rendertime all’s working well.
I also found that if you CLICK on the time line, it does update the PRT Surface.
If you just drag the time slider, or advance with the arrows or next frame keys, it does not.
Hiding the Field Magma solves it, so it is probably a Nitrous / validity interval issue.
I am going to log it.
Unfortunately, we just finished the updated Max 2016 installer an hour ago, so tonight’s release won’t have this fixed.
But we will try to post an update as soon as we figure it out.