Hi Dan, for me Sketchup always opens with the last project pre-loaded, so the second I get past the nag screen “Start using sketchup” then boom it crashes before I have a chance to close any windows. I do seem to have had success (fingers crossed, it’s working so far) by deleting the preferences using terminal with Sketchup closed and then typing in the following
defaults delete com.sketchup.SketchUp.2014
Hopefully, that has fixed it since it seems to be working OK - I have a few hours work to do in Sketchup today so I will confirm how well that went later