I don't have an answer for you... but I share your pain. I walked through the database conversion a few days ago, saved my data, and then embarked on the task or wiping and upgrading my phone from Android 4.1.1 to 4.1.2. The saved file I have in hand is just a normal .zip file with three files: settings, tracks.db and waypoints.db ... but somehow neither the new version nor the old version of Locus will import the data.
Update: I found a solution. Happily, I had my entire SD card backed up before the restore, and simply by restoring the /sdcard/Locus folder to its previous state, I'm back in business as I was before.
Update several hours later: The backup and restore facility from the "Functions" menu seems to be working smoothly, after all. Locus is just such a complicated program that it took me quite awhile to test everything out and explore all the backup and restore functions thoroughly.
I'm not sure if any of this helps you, but perhaps it'll provide some food for thought.
Update: I found a solution. Happily, I had my entire SD card backed up before the restore, and simply by restoring the /sdcard/Locus folder to its previous state, I'm back in business as I was before.
Update several hours later: The backup and restore facility from the "Functions" menu seems to be working smoothly, after all. Locus is just such a complicated program that it took me quite awhile to test everything out and explore all the backup and restore functions thoroughly.
I'm not sure if any of this helps you, but perhaps it'll provide some food for thought.