@jaceguay Thanks for your input. I noticed when it opened up just before it crashed it would show a file window for a quick instant. I could never see it because it went so fast, but I used my phone and took a slow motion movie and was able to see the file name. Next I renamed the file so it wouldn't open it up, but it still opened up a window. I did my slo-mo trick again and found that somehow it was opening up the renamed file! I moved it to my desktop, and finally Sketchup is working fine again. Interestingly enough the file opened fine with a Windows version of Sketchup, but not on my Mac. I'm going to have someone who knows more about the program than I do take a look at it on his Windows PC to see if he can find anything wrong with it... Interesting stuff....