Comment # 2 on bug 941868 from Wolfgang Rosenauer

It works for me with Thunderbird 38.3.0, Lightning 4.0.3.1, openSUSE 13.2

I have no idea what to fix when I cannot reproduce. At least not what is
described in the initial upstream bugreport.

Please reopen with exact steps how to reproduce the issue.

I did
Edit-Preferences-Calendar-Categories
Edit any category-choose color-save
Afterwards was displayed correctly in the category window with the new color.