The model totally disappears into space when I select "edit sketch" of a feature. The only way to get it back into the screen is to select a view icon.
Very annoying and never happened before I upgraded to SW18.
I don't remember anyone else reporting that here. I assume these bodies that are disappearing are above the sketch in the tree, and not below it? Have you checked to make sure your graphics card and driver are up to date?
Do you have this checked?
Yes. I have it selected...because I want it to work like it is supposed to.
Well, then, is it possible that when you edit the sketch, your model is off screen? If that is the case, then is your sketch near the model?
If that is NOT the case, then I would say that you might have to reset your "View Bounding Box". See this article:
I just remembered that I've seen similar behavior occasionally since that option Dan highlighted was modified to include when editing sketches, and not just for new ones. I generally just hit my "Fit" button on my 3d mouse without a second thought. It's probably a bug that should be reported to a VAR.
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