Hello Try to save a model (quite some hours in) and when i save it says the model has a error but Sketcup can fix it, But it can’t, end with; – Results of Validity Check. *** Problems were found that could not be fixed! *** The entity at address cd8800 has an invalid id (0) destroyed (0) Any …

Did Dan’s suggestion not help? Another thing you could try is to select everything in the model and copy it into a new blank model (this will be a pretty heavy operation if the model is large). That often causes SketchUp to discard cruft that has accumulated in the model’s database of geometry.

Cannot save file - model broken won't fix it

Technical Problems SketchUp

slbaumgartner January 22, 2017, 6:35pm 4

It is definitely a bug and has been noted before, e.g. in

I don’t think anyone has yet figured out quite what triggers this bug.