2,6GHz i7, 16GB RAM, Intel HD Graphics 530 1536MB.
I've been using LR since beta without problems. This week LR Classic started to crash every time I try to export images, sometimes it also crashes while editing pictures.
Somtetimes only the app crashes, most of the time the whole computer restarts.
I have tried to turn off GPU in preferences. I have tried to uninstall the app and re-install.
This is service affecting and needs to be fixed immediately.
We could not find any crashes reports tagged with your emailaddress registered on this forum. If Lr crashes next time, add your emailaddress in the crash report so that we can identify your crash report and debugthe issue.
You can reference https://helpx.adobe.com/photoshop/kb/submit-crash-reports.html for more details.
If that doesn’t fix it 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.
If that doesn’t work try launching Lightroom from your other (admin or test) account, with a new catalog, as a test. Does it run OK? If it does it may be a corrupted preference in your Username/Library folder. Check The Lightroom Queen site for instructions on how to reset your preferences (https://www.lightroomqueen.com).
Let me know.
The macOS CoreGraphics API is implicated in one of the crashes. That is odd. I would say either the files are corrupted on the disk or there is some disk controller issues.
Given that you have created a brand new catalog and new set of photo files, and Lr still crashes. It is either the disk or the disk controller is flaky. Is the disk an internal drive? Try a new catalog and put it and the image assets on a different drive and see if it makes a difference. Is the cable secured?
Crashed Thread: 27 Queue Processor - RenderQueue_ReadPreview
Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Illegal instruction: 4
Termination Reason: Namespace SIGNAL, Code 0x4
Terminating Process: exc handler 
0 libsystem_malloc.dylib 0x00007fff619153eb nanov2_allocate_from_block + 615
1 libsystem_malloc.dylib 0x00007fff61914a61 nanov2_allocate + 130
2 libsystem_malloc.dylib 0x00007fff6191498e nanov2_malloc + 56
3 libsystem_malloc.dylib 0x00007fff61907dfd malloc_zone_malloc + 103
4 com.apple.CoreFoundation 0x00007fff357ffb0e __CFBasicHashRehash + 303
5 com.apple.CoreFoundation 0x00007fff358f44f1 __CFBasicHashAddValue + 89
6 com.apple.CoreFoundation 0x00007fff357fe180 CFDictionarySetValue + 187
7 com.apple.ImageIO.framework 0x00007fff38237ec0 IIOImagePlus::setGeometry(void*, CGImagePlusGeometry) + 1626
8 com.apple.ImageIO.framework 0x00007fff38237733 IIOReadPlugin::prepareGeometry(InfoRec*) + 871
9 com.apple.ImageIO.framework 0x00007fff382b8dde IIOReadPlugin::setupImageProviderCallbackV2(InfoRec*, CGImageBlockSet* (*)(void*, CGImageProvider*, CGRect, CGSize, __CFDictionary const*), __IOSurface* (*)(void*, CGImageProvider*, __CFDictionary const*)) + 28
10 com.apple.ImageIO.framework 0x00007fff382371df IIOReadPlugin::postInitialize(IIODictionary*) + 423
11 com.apple.ImageIO.framework 0x00007fff3822d792 IIOReadPlugin::callInitialize() + 312
12 com.apple.ImageIO.framework 0x00007fff3822d23c IIO_Reader_AppleJPEG::initImageAtOffset(CGImagePlugin*, unsigned long, unsigned long, unsigned long) + 112
13 com.apple.ImageIO.framework 0x00007fff3822bb2e IIOImageSource::makeImagePlus(unsigned long, IIODictionary*) + 474
14 com.apple.ImageIO.framework 0x00007fff3823c1ab IIOImageSource::createImageAtIndex(unsigned long, IIODictionary*) + 61
15 com.apple.ImageIO.framework 0x00007fff3823c0b2 CGImageSourceCreateImageAtIndex + 237
16 com.apple.CoreGraphics 0x00007fff35d3bb11 CGImageCreateWithJPEGDataProvider2 + 159
From the beginning when I bought the iMac, I also ordered the extra ram memory that I replaced with the original one, I do not remember well enough, but I think it was a period when the problems started.
I thought it was a different kind of problem, namely that it was software or an operating system. After many upgrades, I realized that it was not a problem, and my negligence was well deserved because I did not wear the service until a few days ago.
Authorized service said that the diagnostics they did show no hardware errors. That is, everything is ok.
Before going to the service I tried to test the ram memory myself by individually removing and returning it, I came to the conclusion that a single memory is problematic. However, after a few months, the problem continued. And I returned a memory that seemed problematic to me.
I installed Windows 10 on iMac and also tried to export photos through it and the same problem happened, iMac restarted.
I tried several times to install a fresh system( from Siera to Catalina), everything was reset to factory settings and again there were problems with them.
Now I tried with external hard disk, to install OS on it and through it to try to export the photo, for now everything works ok, but it scares me not to be the same problem again as it was with ram memory, some time ok then after problems again.
Do you have any advice on what to do?
Clean Classic Install Procedure
- Close Lightroom
- Restart the computer
- Use the Adobe Creative Cloud App to uninstall Lightroom Classic
- Restart the computer
- Install Lightroom Classic via the Creative Cloud App without launching any other programs.
- Restart the computer
- Launch Lightroom
- Wait 5 minutes