Strange behavior

[dennishmiller]

Strange behavior using the newest (May 2020) Classic release.   When I drag a slider to the right, contrast for ex., I see the change having the intended effect on my image. But when I take my finger off the mouse at that point, the image returns to its original look and the change is undone, even though the slider is still at the new value.   Any thoughts?

[DdeGannes]

Works fine on my iMac, maybe something to do with the mouse. Check if there is an update for the mouse software.

[dennishmiller]

Will check mouse driveres, but I thik Mac drivers pretty much update themselves (?).

[JP Hess]

Not seeing that behavior here. Windows 10 Home Premium, Lightroom Classic 9.2.1. All adjustments work as normal, remain as set.

[AxelMatt]

The first thing that you should try is to switch off the GPU support from the Lightroom preferences and check if that helps to fix the issue.

Go to Lightroom > Preferences > Performance tab > Uncheck "Use Graphics Processor" > Restart Lightroom.

https://helpx.adobe.com/lightroom-classic/kb/lightroom-gpu-faq.html#troubleshooting

https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html

Another step is to try to reset the Lightroom preferences.

https://www.lightroomqueen.com/how-do-i-reset-lightrooms-preferences/

If this doesn't help we need more informations about your environment.

• Which operating system do you use?
• Which version of Lightroom do you use?

Please post the exact version and not only phrases as "recent", "latest" and so on.

Do you get an error message? If yes, please posrt the exact message or an screenshot. 

[dennishmiller]

9.2.1 on Mac High Sierra 10.13.6

Disabling the Graphics Processor seems to have done the trick (no idea why...) Thanks for that and the other tips. 

[GoldingD]

Sounds like a canadate for resetting the preference file. Resetting the preference file is Adobe speak for deleating the preference file and then letting Lightroom Classic to recreate it.

The preference file can get corrupted, resulting in odd behavior. Some people have a knee jerk reaction in thinking they need to uninstall then reinstall Lightroom Classic, maybe that could be called for, but it would be better to first reset the preference file.

Be aware that resetting the preference file will result in Lightroom Classic creating a new catalog instead if opening your previously opened catalog (normally) so make sure you know where your catalog is. 

Be aware the resetting the preference file will revert some settings in Preferences to defaults. So be aware of what you have changed, so that you can put those back the way you want them.

some links:

https://lightroomers.com/replacing-the-lightroom-preference-file/745/

https://www.youtube.com/watch?v=bARt-hoCc2Q

https://helpx.adobe.com/lightroom-classic/help/setting-preferences-lightroom.html

https://helpx.adobe.com/lightroom-classic/kb/recover-catalog-images-resetting-lightroom.html

[dennishmiller]

I'll keep that in mind for future reference. Thanks much.

[GoldingD]

Hmm, should have asked.

Please post your system info as lightroom reports it, interested in GPU section, but please include all info from first line down to and including plug-in info.

In lightroom, click on Help, System Info, Copy. Paste into a reply.