I talked with VW support and this is how we solved the problem:
Remove any classes in your viewport on the sheet layer that contain viewports. This embedded reference really messes with the PC version of VW.
Next, duplicate the Viewport.
Now, turn everything else off except for the content of your referenced viewport. Turn on any viewport class(es) on this new viewport which you turned off on the original.
This way you may have, for example, one viewport with the architectural drawings, and one with your lighting instruments. This layered approach to viewports on sheet layers seems to be a temporary fix until a patch is released. The support team is aware of the problem and working on it, from what they told me.