I’ve seen other people having this problem. It started doing this about three days ago. After opening the downloader and clicking play, the window pops up for a split second and then disappears. The GW2 icon is still on the taskbar but does not respond to being clicked and the client cannot be opened back up.
I have tried reinstalling GW2 and my graphics card drivers, and repairing the client, running as admin, and so on. As I am unable to resume play until this issue is resolved, I’d love to know if there’s any solution for this.