Confirmed...new Malwarebytes antivirus release 3.8.3.xxxx restores full IPv6 connectivity...they copped to the flaw in previous release.

Just got a notice from Malwarebytes that a beta release of MBAM has addressed and fixed the IPv6 connectivity problem. This is the way the tech world should work, but rarely does.

OK, problem solved, with huge assist from engineer Adam Li, via a remote connection! He determined that a protection option on latest Malwarebytes (installed on both Windows machines) software...

Thanks again, appreciate the efforts being made to unravel this mystery!

Thank you for weighing in, Tony, with your suggestions. Tried the “ipconfig /release6” command and got an error message saying “an error occurred while releasing interface Local Area Connection 3:...

Nothing notable, certainly no “critical” flags associated with windows laptop.