The Changelog is in the same place as all the others: on the Maemo Mapper Files page (click a version number to see release notes and the changelog for that particular version).

If you are getting a dependency error, then you will have to upgrade to the most recent official firmware (3.2006.49-2, aka maemo 2.2, aka gregale). This is NOT the OS2007-on-770 firmware, so you don't have to worry about it breaking your 770. I hate to force you guys into update, but it is necessary in order to properly support both the 770 and the N800 platforms. I should probably remove those debs from the mistral and scirocco repostitories, though - woops, my bad.

If you are getting the "encrypted or is not a database" error, please delete the "poi.db" file and restart Maemo Mapper (at which point Maemo Mapper will create a new poi.db). If you haven't changed the defaults, then the file should be located in the Documents directory. I apologize for the inconvenience. If you want to keep your old POIs, you will have to convert the poi.db file as instructed above.