Thunderbird is not downloading messages from Gmail account.

On one of my Windows 10 computers, new Gmail messages have not downloaded to my Thunderbird (version 60.5.3) inbox. Everything works fine on my other Windows 10 computer. This has been since yesterday afternoon. What is strange is that one email email did download to Thunderbird. When I checked server setting on both machines, they are the same. If I check Gmail directly, it shows over 30 new emails that did not go to my Thunderbird inbox. The Windows 10 version is 1803 updated 3/1/2019. I have tried running Thunderbird with Safe Mode both on and off. When I check for new emails in Thunderbird, it says no new messages. The computer in question is my main desktop machine.