I am noticing that if I go to Doc Properties > Mesh just to check the current mesh settings - first it shows me the “Render mesh quality” page with Jagged, Smooth and Custom; if Custom is checked I hit the "Details button to see the custom settings. If I then hit the Cancel button without having changed anything, it still regenerates the display meshes for all visible objects - I see “Creating meshes… Press Esc to cancel” in the command line and if the meshes are dense, it takes a few seconds before finishing.
IMO, this is hooked up incorrectly, hitting the Cancel button should not do anything if I have not changed the setttings.
OK, wow, I went to disable Bongo, just into Options>Plug-ins (not Mesh settings), disabled it and OK, then I got the meshes being recreated… And no, after a Rhino restart, disabling Bongo didn’t help. It looks like every time the Options dialog is closed, it re-meshes if I hit OK. No matter which page it was on. But not if I hit Cancel, remeshing only happens if I am on the Mesh page.