I have noticed that sometimes a Gramps database will not show up after the update to 5.2. If this happens:
- close Gramps
- (if you use the flatpak) make sure your database file (.gramps or .gpkg) and all media files are within either Documents, Downloads, or Pictures. (Starting with the 5.2 flatpak, Gramps is restricted to only those three directories for improved security.)
- open your file browser and find your .gramps or .gpkg file that you want to open
- right click on the file you want to open
- select “Open with Gramps”
- wait a couple minutes for the database to update to the 5.2 version.