@gerrit-van-kuilenburg
Timo recently responded in a thread with a similar issue: (click)
(Google Translate)
Those white boxes you see are so-called "Card Tiles". The world is, as it were, divided into huge jigsaw puzzles with different zoom levels. Depending on your zoom level, we then build a jigsaw puzzle with those Card Tiles that corresponds to your image. That is the most efficient way of showing a route.
What strikes me is that only a few tiles are missing. In general, this depends on the occupation of your (home) network. The card is then 'overruled' by another network process and some tiles are missing. Long story short: the problem should solve itself because your network is free again.
It occasionally happens that the suppliers of the Card Tiles themselves have some difficulty in delivering the tiles because, for example, many users worldwide use the service at the same time. Even then the problem will resolve itself.
My main check question is therefore: has the problem been solved in the meantime? If not, if you keep the map in view for a while. Do the tiles eventually load after a while?
