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Win 10 w/ T-bird 45.3.0: While writing new messages, the active window switches back to the main Thunderbird window about every 20 seconds. Is there a fix?

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Using Windows 10 with Thunderbird 45.3.0: While writing new messages, the active window (on it's own, mind you) switches back to the main Thunderbird window as I merrily type along. I then must manually recall that window. This continually happens every 20 seconds or so. Is there a fix for this?

Using Windows 10 with Thunderbird 45.3.0: While writing new messages, the active window (on it's own, mind you) switches back to the main Thunderbird window as I merrily type along. I then must manually recall that window. This continually happens every 20 seconds or so. Is there a fix for this?

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turn off the change of wallpaper in Windows every 20 seconds.

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Thanks Matt. I was having the same problem. I had my wallpaper refresh on every 30 minutes and since I changed that to once a day, I haven't had the problem!