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When you draw the windows are you double clicking on one of the OpenStudio spaces first so that it gets saved to the .osm file? It's possible to draw a window that only gets saved in the Sketchup file but when you re-open the .osm, the windows would get removed. Note that you can also draw the windows as "loose" geometry where you want them and use the "Project Loose Geometry" button in the OpenStudio toolbar to transfer those windows to the associated OpenStudio spaces. One way to check if this is what is happening to you is to see whether the window is translucent. When I draw a "loose" window not associated with an OpenStudio space, it isn't translucent. But after I use the "Project Loose Geometry" button, the window becomes translucent.