Google Maps ceased to work with OW 5.5.3 today for no special reason.

Zooming out causes the map to scroll horizontally without showing a scroll bar. There's no way to get the map back to the center of the page.
Additionally, the cursor switches to the blue questionmark indicating a missing image file while moving it over the map.

Emptying the cache or rebooting did not work.

Is there anyone with a helpful idea?