LW seems to have problems saving to an external drive for some reason. I guess it depends whether it is permanently connected & what type of drive. But that should not affect LW opening.

I have same problem. I cannot run LW 4.18 on my main account. So I installed OSX on a different drive, LW 4.18 runs fine on there.

I deleted from the external and just saved it to my Mac, and it's working. Mac support said that I can just save to my Mac, and then I have it automatically back up everything after an hour. Then I can delete from the Mac and just keep it on the external hard drive, does that sound right?

Thanks for your help

Jeff