Test: start Thunderbird in Safe Mode https://support.mozilla.org/en-US/kb/safe-mode-thunderbird

Menu icon > Options > Display > 'Tags' tab select the 'Tag' name click on 'Edit' select new colour click on OK

Report back on results.

Hi,

thank you for the reply. Started in safe mode and went through the process as described, with the same result.

I also tried renaming 'To Do' to 'To Do NEW' [in the edit screen] but nothing happened when I clicked on 'ok' - no error but also no update in either text or colour.

I am on windows 10 - I tried running TB as windows admin user with the same results.

In Thunderbird Help > Troubleshooting Information click on 'open folder' button a new window opens showing contents of profile name folder.

Exit Thunderbird now.

Select 'prefs.js' folder to get focus, then right click on 'pref.js' file and select 'Properties'. Check 'Attributes' 'Read-Only' and 'Hidden' checkboxes must NOT be selected. Are either of these selected ? Uncheck if they are selected. Click on 'Apply' click on 'OK'

Delete the following:

• session.json
• xulstore.json

Start Thunderbird.

prefs.js have neither option selected. Deleted both session.json and xulstore.json

Alas, I still have the same error message when trying to change a tag colour

Editing tag colors is also broken in TB 69b4, but works in TB 60.8. As a workaround, you can change the colors in Tools/Options/Advanced/General/Config. editor by right-clicking, e.g., the preference mailnews.tags.$label1.color (Important tag), Modify, and entering a hex code, close Options. Same for custom tags, e.g. mailnews.tags.newtag.color for the newtag tag.

If you want to submit a bug (TB 68 meta bug), include a link to this discussion.

Hi sfhowes,

Colours edited - I can now easily read the tagged in the dark theme  :)

fantastic, thank you for your help.

I have filed a bug on the strength of being able to duplicate this on Thunderbird 68,

https://bugzilla.mozilla.org/show_bug.cgi?id=1578148

Feel free to add any relevant information, or dup it if there is an existing bug I could not find.

Fixed in 68.1 Not sure exactly when we will see that released, but fairly soon I would think.

Hi Matt, fantastic, thank you.

TB 68.1: https://archive.mozilla.org/pub/thunderbird/releases/68.1.0/win32/

https://www.thunderbird.net/en-US/thunderbird/68.1.0/releasenotes/

Hi sfhowes,

updated and I can now edit the existing tag colours. Thank you!