What version of SketchUp/LayOut are you actually using? Please complete your forum profile.
@gilyisrael said:
In Layout, it used to be possible to extract the SketchUp files from Layout. Is that still possible?
Yes, The LayOut file is just a zip file. Use a ziputility like 7-zip to open it and copy the .skp file out of the ref folder.
Alternatively, in Document Setup>References, unlink the .skp file from the original reference. Then right click on a viewport and choose Open with SketchUp.
Note that if you've modified any of the scene properties for the viewports in LayOut, changes to those properties in the SketchUp model will not appear in the viewports unless you reset the properties for the viewports.
Where have you been saving the .skp files as you are working on them?
This topic doesn't belong in the Bugs category.