Component Copy Leaves some Geometry behind

SketchUp Pro
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1

Arch lattice and teeth.skp (618.9 KB)
I finally got my lattice work completed, though I will add the cog elevator later once it’s in my main Arch.
But when I tried to highlight and make the attached arc into a single component that could be copied into my main sketch, only the red lattice work copied over. I lost the blue base and the internal tracks, even though they appeared to be highlighted along with everything else to be copied.

A possibly related issue is that my main Arch starts flashing when I add this component to it. Does this mean my arch is becoming deformed or…?

2

…uh, never mind. I figured out the problem and moved the arc into its permanent home.

I’m still concerned about the occasional flashing and the slowdown of the computer in general though. Is there a way to clear memory cache of old moves and history?

My main structure has barely begun to get everything its going to get.

3

Yes, saving the model purges the undo stack.