Why are there black squares on Thunderbird's window?
A known issue exists with the way Thunderbird is captured, occasionally Litmus will take a screenshot a little too fast and some parts of the image of Thunderbird haven't completed loading. When this happens, Litmus shows small black squares in place of the missing content.
To work around this issue, use the 'R' keyboard shortcut on your keyboard to have Litmus take the capture again.
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