Thunderbird V38.2.0 freezes after SLEEP under WIN10 Home 64bit
The freeze happens 8 of 10 times after sleep while Thunderbird was previously running fine. Also noticed a small, blank popup window that can not be dismissed. Must end via Task Manager, restarts OK.
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It is a known issue that is getting attention.
WORKAROUND: Until a permanant fix is issued, hopefully in the next update, if you wish to avoid the hang try setting thunderbird to be offline before sleep/hibernate at File | Offline | Work Offline. Then do the same again after waking the computer to put it online. Or, in cases where the only problem is Thunderbird not getting new mail, do both after waking the computer.
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Versoin 38.3.0 which repairs this issue is now out