GIMP Version: 2.10.12
Operating System: Windows
OS Version: Windows 7 Professional
GIMP Experience: Basic Level

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Hi all,

Yesterday, I upgraded GIMP to version 2.10.12.

Now, all the tool icons are grayed out, but I can still select them and use them, so they are not disabled. My theme is "System".

I'm attaching a screenshot.

Greetings,
Albert.

That is the default symbolic icon set

Go into Edit -> Preferences -> Icon Theme Change to Color and additionally if you want use Custom Icon Size and the slider. OK all that and close preferences.



Edit:
Looks like an upgrade from a Gimp 2.8 (or earlier ) and Gimp 2.10 has inherited some of the settings. Gimp 2.10 will migrate settings and resources from the old Gimp profile usually C:\Users\"yourname"\.gimp-2.8
If you want a clean installation, rename the old profile to say: C:\Users\"yourname"\.gimp-2.8-backup.
Delete the Gimp 2.10 profile C:\Users\"yourname"\AppData\Roaming\GIMP Start Gimp 2.10 and a new empty profile is created. Move any resources over slowly. Some old pulgins/scripts do not work.
If you have a 'smaller' computer display some hints on setting up the toolbox.
https://youtu.be/8M2P0N-qhm0 duration 7 minutes.

Thanks, that was most useful!

Are there any notable "gotchas" known regarding a migrated (from old version) profile?

-Albert.