P: Hang while using Shawdows/Highlights tool with the Histogram panel showing (macOS)

Yes, it's a bug for me. As long as you don't use the sliders in Shadow and Highlights my mac doesn't hang. Use Photoshop every day. Bit of a pain, please fix Adobe!!!!

I come back, personally, I did not take back my personalizations of PS previous versions, particularly the toolbar and workspace, then I had no more worries, even having recreated of very rooms the toolbar and my workspace.

I am on Mac, but perhaps that it is similar on Win.

For those who see the problem on Macs as being linked to anti-virus programs removing the anti-virus program may resolve the situation (BitDefender in my case). Alternatively making Photoshop 2020 an "Exception" may also do the trick. Both have worked for me, the removal route being 100% effective as far as I can tell on my machines but creating an "exception" for Photoshop 2020 works well providing you take a second or two before moving a slider. iIf your over eager you may still get the occasional lock up. Whatever Adobe Photoshop Support told me during an on-line chat I am still convinced this is a bug introduced in version 21.1.0 as it never occurs in the earlier versions I still have installed.

Same problem for me.

1. Open an image 

2. Duplicate a layer

3. Convert layer to smart object

4. Choose Image -> Adjustments -> Shadows/Highlights

5. Drag the Shadows adjustment slider or/and the tone slider

The spinning colour wheel arrives and never goes away. PS stops responding and has to be force quit.

I have figured out if you just fill numbers into the boxes that you can use the tool but if you touch the sliders you're done.

Catalina 10.15.3

Add me to the group that has had this problem for a week. Mac OS 10.13.6, and PS 21.1.0. As soon as I open Shadow/ Highlights and attempt to alter the shadow default, PS freezes and I have to stare at that colorful demon of a rotating ball. 

For me, there will not be answer of Adobe the only resolution is mine since a net reinstatement and without personalization works perfectly.....

There are only 100 persons who announce problems, on how many potential users..... It is what make me say that there is not of bug, only some old relics which do the pigsty!

It is necessary to be modest and sometimes to accept that problem can come from be!

Merci, thank you for that Yves.  I'll just do my shadows work in Lightroom for now until an easier and less drastic solution appears. It serves me right for going back to the old pre-Lightroom ways really.

Google translation..... english at the bottom of this post

Plus haut dans cette discussion j'ai expliquer comment faire pour  remettre tout en fonction....

Il faut désinstaller PS 21.1.0 sans conserver vos paramètres personnalisés, supprimer toutes les références à PS dans votre système, pas les données !!!!!

Redémarrer l'ordinateur, NE PAS REPRENDRE vos paramètres personnalisés, mais les créer de nouveaux, je ne parles pas des formes, brosses, dégradés etc. mais en particulier des outils, barres d'outils, espace de travail.

Mais essayez ces fonctions avant de modifier les paramètres de PS, si ça fonctionne, ce sont un des paramètre personnalisé qui comporte un problème.

Personnellement, j'ai redéfini les barres d'outils et les espaces de travail et maintenant tout fonctionne parfaitement. (macOS 10.15.3 sur iMac et PS 21.1.0)


Google translation.....

More high in this debate I have explain how

delay everything in function....

It is necessary to uninstall PS 21.1.0 without keeping your individual parameters, to abolishing all references to PS in your system, not data!!!!!

To reboot the computer, NOT TO TAKE BACK your individual parameters, but to create them of new, me do not speak about forms, paintbrushes, gradations etc but particularly about tools, toolbars, working space.

But try these functions before changing the parameters of PS, if this works, it is one of individual parameter which includes a problem.

Personally, I redefined toolbars and working areas and now everything works perfectly. (macOS 10.15.3 on iMac and PS 21.1.0)

I am having the same problem.  No BitDefender here either on the Mac.  I imported a raw file from Lightroom to PS and after a lot of cloning and tweaking to the shot (now wasted), I felt it needed a little more shad/highlight work.  It's hanging each time and needing a force quit.

Sounds unlikely. I've developed this as soon as I updated to 21.1 & don't have BitDefender on my Mac.