By some users the new version stops working when it loads the tiles of a map. Most when you do not have a fast internet connection. In this case the App stays open, but does not respond to user actions. It should only occur when using OSM based maps or the Bing maps.
I corrected the error and will submit a new version to apple this weekend, containing also some other fixes.
As a workaround..
Update: I send a update to apple on 06/21/2015. Hope it will be approved before the next weekend!