I ran into a bit of a bug that's sounds similar to trouble others are having, based on reviews in the app store. Citizens hear me out, this could happen to you!
As of v1.1.0, the bottom button bar is now configurable. I figure that I would get rid of the "Home" button since it only gives me information that I'm already familiar with, and I'd much rather the space be used by a more useful function such as "Favorites" or "Nearby".
The moral of this story: Do not do this!
I didn't realize at the time, but it seems the app doesn't load the LiveATC database at startup unless "Home" is somewhere in that bottom button bar. It doesn't need to be the first one on the left, but it does need to be there. Suddenly all my favorites were being auto-removed, nothing would show up under U.S.A. or under "Countries" and the app would crash when I went to "Nearby" even though I live in the San Francisco bay area, nearby at least three major airports.
Everything went smooth again after I realized what was happening and put the button back. Ideally, the app would load the DB on start regardless of the configuration of the button bar. Another option, I supposes, is to make it such that the "Home" button cannot be removed, but I would find this solution less than optimal.
Now if you'll excuse me, I'm going to get poor Charlie off the M.T.A.