Quote - Are you injecting new materials into the figure or actor(s) as part of the process?

I'm injecting new geometry, which contains new usemtl. Sometimes injecting the materials into the figure as well, sometimes not.

Quote - What does this perpetual refresh cycle look like?

The Poser Surface disappears for a second or so, then comes back again, then disappears, and so on ad infinitum. If a material other than preview is selected, the refresh will revert to the preview material. I wonder if the problem relates to the way the materials and groups are set up in the geometry. Some actors have multiple groups, with a different material assigned to each group.

Problem is that I'm doing a lot of different things, at the end of which I may or may not end up experiencing the problem. I really need to chop the process up into small pieces, and test the individual parts of the process to find which part is causing the problem. But that could be a lot of work.