Tested it out and it seems to be when I use the cursor and highlight the text to delete it and I happen to move the cursor off the pop-up. It doesn't seem to be happening when I do select all with my keyboard short cut.
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When you're filling out the subject line and preheader if you select all the text and delete it force closes the pop up and you lose your text. It's been happening to be for a couple months now and it happens on my work PC and my Mac at home.
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