@tt_su said: That disappearing group (visually) sure looks like a bug. I'll file a bug internally (SU-29499). Meanwhile, the workaround is to specify scaling in X Y and Z explicitly. Ok, Thom. It is a small bug but it took me a long time to be assured it was not my code fault and try another way to do it.

Yes, view.invalidate will tell SketchUp to redraw. It doesn't redraw immediately, but let SketchUp manage update rate. Not sure how this is related to dialogs, focus and ALT key though...

I think I figured it out. Enabling transparent mode for an operation will simply merge it with a previous non-transparent one, regardless if the previous operation is active or not. So, even this should work: model = Sketchup.active_model model.start_operation('Main OP', false, false, false) # A placeholder for all sub operations model.commit_operation x = 0 while (x < 100) model.start_operation('Sub OP', true, false, true) # Do some crazy geometry manipulation, # that I don't want the observer to respond while I'm doing it... model.commit_operation # Committing operation will allow the observers to respond and update view properly. # Do something involving view, like exporting proper view into images # Increment counter x += 1 end Edit: Nevermind. transparent flag is limmited to 100 operations. After that it turns into a normal operation, flooding the undo stack. Running one operation with ui_disable set to false does update the view properly, so I'll stick with it, but it's slow...