I think I'm right in saying that the version of OpenSubDiv Poser uses was updated from v2 in P10 to v3 in P11, plus I believe the boundary rule was changed as well. Might account for the change in behaviour between the two.

@nerd, would there be any possibility of freezing the mesh temporarily? Like a button in the Properties that when active would lock the resolution at whatever the Preview level was set to, and convert the OSD surface to actual geometry until switched off?

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