@aceshigh said:

yes, in my case, it was only in the render window that geometry disappeared, never in the model / sketchup file.

Same here. the geometry disappearance just happened when i used advance camera tools. I tried everything! hide frustum, re-open the file, explode, re-group, purge unused, re-apply all materials, reinstall 1.6 beta and sketchup but same results.