The background of the map becomes black instead of transparent and it keeps flashing every few seconds. This bug is there since the launch of the Alpe du Zwift and still has not been fixed (PC Windows 10 here). It does that every single time I hit the climb.
Same Issue here.
The turn map flashed constantly.
Encountered it first at the snow section when minimized the Zwift App a few seconds afterwards it start flashing.