For some reason.....

[Mike Amos]

When I am just minding my business and preparing to render or making a group or whatever it is at the time, geometry vanishes. I look to see the last action sketchup has preformed and for some unknown reason a validity check occurs unprompted. I undo this and the geometry is un deleted.

Simples.

No idea why this is.

[Box]

Do you have Auto save set to save, do you have automatically fix ticked.
If so it's not a bug it's just doing what you have told it to do.

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[Mike Amos]

OK, found the problem, not auto correction etc. Sketchup was teleporting the geometry for some reason not known to me.

Fingers crossed this is a transient event.

Thanks for the tips, Box. Appreciated.