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Colors missing from lightning calendar in thunderbird - events are transparent

I have lost my colors in Lightning calendar. All of my events are now colored transparent with a slight fade. So I can see the outline of the event on the calendar, but that is just because it fades from transparent to gray. I am not sure what caused this. I did abort a mozbackup today, but I would not have expected that to cause something like this.

I was using TB 13 earlier today when I first noticed this. I then upgraded to TB 15 and the problem persists.
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