I had that issues with 1.0.8.21. Now I have SailfishOS 1.1.0.38 (Uitukka) installed an did the uptate to your 0.49.7, Jolla is still a test phone. Tiles are not loaded if "Sqlite" at "Options->Map" is selected, with "files" it works. I deleted all at "~/.local/share/harbour-modrana/maps/" and started modrana with option "Sqlite". A "lookup.sqlite" is created, but ist stays empty, same on the screen (no map visible). Back to "files" the tiles are loaded and displayed correctly.