Cookes.9832

So, I have Windows 11 and have been playing GW2 on this system since the update from Microsoft. I have had zero issues until a couple of days ago, where I completed the Forging the pact mission/quest, received the in game message etc and then the game froze, I was booted and when I logged back in, the mission had reset. Fast forward another 5 visits to the mission, same thing happens! Contacted support to be told it is basically due to the unsupported Windows 11... Extremely unlikely! Have now uninstalled and reinstalled GW2 with no effect, still in the same position as I was a few days ago. What am I supposed to do? Any ideas?