I have seen this too. Note that they moved there web site and using the new url <<a href="http://msrmaps.com/ogcmap.ashx?version=1.1.1&request=GetMap&Layers=urbanarea&styles=&format=image/jpeg&">http://msrmaps.com/ogcmap.ashx?version=1.1.1&request=GetMap&Layers=urbanarea&styles=&format=image/jpeg&</a>> is slightly better but still has issues.<br>
<br>One annoying seen in JOSM is that it somehow caches the tiles. Deleting the layer is not enough, you need to retsart JOSM to (hopefully) get the real tile and not a blank one.<br><br><br>