P: Crash switching between programs

Since you're on a Mac (I'm a Mac IT Pro), try this: Give your Mac the "once over"! Run the free Onyx (https://www.titanium-software.fr/en/onyx.html), reboot. (In Onyx just run everything in the Automation tab). Run Disk Warrior if you can ($120),  (https://www.alsoft.com), reboot. If you can’t do Disk Warrior, at least run First Aid from Disk Utility. Also just doing a "Safe Boot" can clear out caches (restart, hold down shift until you see "Safe Boot" on the screen, then reboot normally. 

Hi Stephen, thanks for submitting a crash report with your email address. I was able to find your report. The primary crasher you're hitting should be address in a forthcoming update.

I haven't had a crash of LR or PS for years! But then, I use Win10 which 'just works'.

Happy Xmas,

Bob Frost

C.C., along with LR and Bridge have all gone down in the last couple of days. A sign of the times?

I have had also Photoshop crash several times on me recently.  It's only the latest version that is doing this.   I have not upgraded my Mac to Mojave yet.   I only use Photoshop a few hours per week so it's significant that I've had crashes.  I edit headshots and portraits with perhaps a couple dozen layers, most of which are not full copies of the original but just adjustment or levels etc. 

Machine is 2015 MacBook Pro maxed out.  All software is current except the OS is pre-Mojave.  I am sorry that I don't have more information about the crashing, I will keep a log from now on.  

It is feasible that the crashes occurred because I had Chrome open with a several dozen window/tabs open.  I'm not convinced that Chrome plays well with other applications and memory when a lot of windows/tabs are opened.  I've since cut back.  But again, it's only the latest version of Photoshop that is crashing on me.   Perhaps it's a memory leak like Lightroom used to have?  We shall see.