I have been using AnkiDesktop for windows 25.09.02 on Windows 10 and when I returned from holiday, starting Anki only showed a blank grey screen and does not show dialogue with the decks. I have attempted uninstall and upgrade to 25.09.04 and the beta 26.05.b1 and get the same results. The same versions of 25.09.04 run fine on other Windows 10 and Windows 11 machines. The UI reports that it completes a sync on startup and shutdown.
Account and cards are visible and usable on AnkiWeb and AnkiAndroid.
Thx