I've just upgraded a site that was running Civi 4.6.30 to 4.7.24. I use OpenStreetMaps as the Mapping provider. My maps are now appearing as featureless grey maps rather than what I'd expect.
The same seems to be true when I test it on http://dmaster.demo.civicrm.org
My old site continues to render the map in full colour.
The template concerned (CRM/Contact/Form/Task/Map/OpenStreetMaps.tpl) certainly looks very different between the two versions of Civi that I've upgraded from/to.