In this new release we unfortunately had to remove MapQuest from the map sources. See this previous post for more details.
Furthermore we tried to address a problem with background GPS tracking on the latest Lumia devices (Lumia 650). Since we do not have one of these devices for test, please report back if this helps to get background track recording properly.
Important notice: This update overwrites the mapsources.xml with the default one. If you are using a custom mapsource.xml, you need to sync it from NaviMapper again after the update.