Lightroom Classic 8.4: After update ctrl-z no longer works - Windows 10

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  • Problem
  • Updated 11 months ago
  • Solved
  • (Edited)
Windows 10 Pro, current with all updates. After the latest update to Lightroom Classic 8.4, CTRL-Z to undo a change in the develop module no longer works correctly. It undoes the latest change but does not delete it from edit history. Further CTRL-Z does not continue undoing edits. 
Note about performance improvements: I already have a very fast machine with the Quado card set to default to 3D Performance so even on my 4K monitor, Lightroom is fast. My 5K monitor quit last week so I cannot comment about that except that prior to the update, it was slightly slower than editing on the 4K monitor. I notice a small improvement with some of the sliders but most of them are already close to instantaneous. 
HP Z440
Xeon 6-core 3.6/4.0 GHz
five SSD, NVMe for the OS, PCIe SSD for the lightroom library and catalog 
Quadro K1200 
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Posted 11 months ago

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Photo of Rikk Flohr

Rikk Flohr, Official Rep

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I cannot replicate what you are seeing. When I hit [Ctrl/Cmd] + [ Z ] the most recent adjustment is undone and the line is removed from history.  I've tested on Mac 10.14.6 and Windows 10 1809 and both perform as expected. 

Make certain you've installed all your OS updates and reset your preference file. 

A Preference File will survive a Lightroom uninstall/reinstall. Sometimes weird behavior is corrected/cured by resetting the preferences. 

Reset Procedure:1. Close Lightroom.
2. Hold down [Alt/Opt]+[Shift] while restarting Lightroom. 
3. Overwrite the Preferences when prompted by the dialog.
4. Close Lightroom.
5. Restart Lightroom.Does the behavior continue after resetting the preferences?
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Thanks Rikk, that fixed it. Will definitely save this tip in my Lightroom tips folder. 
BTW, I prefer the subscription model. This means that Adobe is being funded continuously for improvements and I've noticed a greater number of improvements and reduced bugs since the introduction of this billing process.