I imported some Sketch Up models and using them.
When I have saved and closed the project file, Sometimes some models has disappeared.
I use "Frame Layer" and Viewport has zoomed somewhere but there is no model.
This situation happened to me many times and what can cause this condition?
PS: I'm using latest version of CityEngine
Esri CityEngine 2013.1 build 140203 (release, win32-64bit)