Just adding to here. I have been getting sporadic blank white screens on the launcher again lately.
The usual failure mode is that the first attempt to launch brings up a white screen.
During a crash the launcher log file ends on
“[10:16:42 2023-02-11] Launcher: Game Update Not Found”
The whole system is then unstable. Dragging windows around leaves traces behind. If I can successfully kill zwift it will open fine on the next attempt.
Windows 11 Pro 22H2 22621.1105
Intel(R) Core™ i7-1065G7 with 16GB Ram
Zwift Up to Date
This happens both with my internal Iris GPU (which I rarely run with due to the game crashing bug) and on my external GPU (2060 Super 8Gb in a Razer eGPU enclosure)