I see that you have Lightroom 6.3 installed on your computer, so I would suggest you to install the latest version of Lightroom 6.5 on your computer.
Click on Help>Updates.
Once updated the application, please let me know if the application still goes non responsive.
Nope. Updated it, didn't use for a few days, and now tried to export a file, and it went beach ball on me again. Not even with sleep this time.
Thank you for the update, I would suggest you to go to the preferences of Lightroom>Performance> uncheck the option for " Use graphics processor".
Once done, restart Lightroom and then try to export the file.
Had several crash occurrences again, worsening each time. Deleted the prefs again so now it started up. But it's still problematic.
The issue has NOT been solved, so please do not mark it as such.
Please enable Root account once, log out from your account and login to Root account and check if Lightroom still crashes or not.
How to enable Root account: Enabling and using the "root" user in OS X - Apple Support
Have you tried the above suggested step in the previous post.
What would be the point of this? It will solve nothing. It is not the same from the root account to get to all the settings and libraries, etc. that are part of my day to day. We need to SOLVE the problem. Not work around it.
Are you wondering if it's a permissions problem?
Did you uncheck "Use Graphics Processor"?
Yes. Has nothing to do with it.
Now a new issue: some of the tools stop working. Like after working in LR for a bit, I can't crop photos anymore, or use a brush or other adjustment tool. Restarting the program fixes it.
Macbook Pro 2011, 16 GB RAM, brand new logic board after GPU failure (twice)
Mac OS 10.9.5
Sounds like you may still have a system hardware problem. LR stresses the system more than just about any other program except perhaps pro video editing apps like Adobe Premiere.
You mean after the entire logic board was replaced TWICE with brand new ones?? I would hope not...
I didn't say the GPU logic board was causing this issue. The fact that it was replaced twice would indicate other components are now causing the issue. The next likely suspects are the AC Adapter, power regulator, battery, memory, or hard drive. Were any of these components also replaced? In a five-year old system (MB Pro 2011) all of these components are subject to failure.
The AC adapter would not make sense, has nothing to do with how LR runs. The PMU is part of the logic board. Battery was replaced. Memory is great, been very thoroughly tested. Hard drive was replaced pretty recently.
OK, you've pretty much eliminated faulty hardware.
I noticed you mention resetting the LR Preferences file, which will cause GPU support to be re-enabled by default.
Please check LR menu item Edit> Preferences and make sure you have 'USE Graphics Processor' unchecked as below. Close all applications, shutdown your system, and then restart your system. Even if it's a unchecked try a shutdown/restart cycle for luck and see what happens.