TB client on W8 machine suddenly cannot access GMAIL account - why? It works from client on other machine and from browser.

It worked fine until 6 days ago - then the machine suddenly could not access the gmail account. Accessing gmail from browser or from Thunderbird on ANOTHER machine works fine.
Using IMAP and ssl.
I can see this problem has many treads on the web - so it should be known to Mozilla.
Regards

Lots of thread on the web about "This problem" very few solutions though or you would not be here.
The usual cause is anti virus or firewall. Which is why solutions are thin on the ground. Have you tried starting windows in safe made with networking? and then starting Thunderbird

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