Created attachment 431539 [details]
screenshot of the issue
Description of problem:
notify-send produces a dialog with a black screen. This may be very problematic in applications like Thunderbird as the text can't be visible as it's using black fonts.
Also urgency icon / colour is not visible.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. notify-send -u critical "Vader" "said darkness"
black pop-up dialog with unrecognisable urgency and white text
pop-up dialog displayed by using system colours
see screenshot of thunderbird notification
This sounds more like a thunderbird bug, if it's forcing black text regardless of the notification theme.
*** This bug has been marked as a duplicate of bug 610910 ***