LR Classic (Mac) crashes when working with masks
In the last ten days or so LR Classic on my 2020 Intel iMac crashes consistently when I work with masks, especially intersecting masks. Screen freezes with the spinning rainbow ball. Can't access any other programs and after 30 seconds the spinning graphic stops and system crashes. When iMac restarts screen brightness is too high and I have to recalibrate with my Spyder unit.
Research online suggested I turn off the graphics processor in LR preferences. I did this and LR has not crashed once since. But program operation is less responsive, slower. Adjustments take two seconds to update onscreen. They were very fast previously. Radeon refers me to Apple and Adobe to address the issue.
My iMac uses AMD Radeon Pro 5500 XT 8GB. I'm on Mac Tahoe 26.1
Here is the first part of the last crash report:
Translated Report (Full Report Below)
-------------------------------------
Process: WindowServer [244]
Path: ???
Identifier: WindowServer
Version: ???
Code Type: 00000000 (Native)
Role: Unspecified
Parent Process: ??? [Unknown]
Coalition: <none> []
User ID:
Date/Time: 2025-12-07 19:45:23.9795 -0700
Launch Time:
Hardware Model: iMac20,1
OS Version: macOS 26.1 (25B78)
Release Type: User
Crash Reporter Key: 29D46C61-E14C-D193-0EDB-0433547914AB
Incident Identifier: B4B55005-6EB6-4CF7-A4A4-688C0E5AA3B7
Time Awake Since Boot: 1300 seconds
Triggered by Thread:
Triggered by Thread: Unknown
Exception Type:
Termination Reason: Namespace WATCHDOG, Code 1, monitoring timed out for service
(1 monitored services unresponsive): checkin with service: WindowServer (0 induced crashes) returned not alive with context:
unresponsive work processor(s): WindowServer main thread is_alive_func returned unhealthy : Display 69986028 not ready: DisplayID: 0x42be6ec
Surface Use Counts: 1(1) 2(1) 3(3)
FB RegID: 4294969366, On Glass SurfaceIDs: 2 1 3, Transactions: [ Active: SurfaceID: 2 ] [ GPU Busy: SurfaceID: 1 ] [ GPU Busy: Surf, has not exited since first loaded
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