Crashlike Behaviour when Creating Block Including Va Objects

Rhino repeatedly shows the hourglass and displays blinking “Creating Meshes” on Command line until minimized and opened again. After Save as Block command.

HI @Djhg, as a test, if you explode the VA objects and generate the block again, do you experience the same behavior?
Can you share the model so we can test it out?

Thanks. I think the problem was imported sketchup models with nested components filling the block list. The issue appears to be gone with those items purged.

Good to know, thanks!