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Do you mean inside the ZD window? For me the white square is appearing on my primary monitor while ZD is located on my secondary. I will keep a watch out for emails with images to see if I can reproduce. It may well be something like that with the stripped-down Firefox engine unable to handle some event.
For me, it only happens on the desktop that zimbra is open on - so if it's open on desktop 2, then the white square appears in front of all other windows on desktop 2. It also appears when zimbra is minimised.
Hopefully the Giant Brains at Zimbra have a fix soon...
I did have dual external monitors when this problem appeared but now I am only using one external monitor with MacBook Pro closed. Haven't tried it with only MacBook display as I use mobile for vid recording/editing and am not reading email then.
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