I updated to DT3beta5 and since have not been able to open any of my existing files nor create a new one.
Every time I try to open from recents nothing happens. Same goes for when double click on one of the existing .dtbase2 files.
Under toe File Menu the Open Database, Open Encrypted Database, and Open Database are grayed out. Open Recent is there, but as I said nothing will open.
I also ran Disk Utility, and just redownloaded and installed DT3 but still the same.