Map tiles aren't always displayed when Map Overlay feature is used.
I'm using Map Overlays with a Mapsforge vector map as the overlay and an online provider as the base map. A few users are experiencing the same problem.
Portions of the map aren't loading. It's displaying white tiles. The attachment shows an example. Neither map source is being displayed. The top white block has text from the vector map that starts out in it. "...bel Preser". If it couldn't download the tile from the online provider then it should have at least displayed the label from the offline map on top.