Sorry for the long delay!
Unfortunately it sounds like the Jaksta file database may have become corrupted. Close Jaksta if it's running. Then can you navigate into this folder:
(your home area)/Library/Application Support/Jaksta
The user Library folder will be hidden by default. To show the contents of it, click on the Go menu at the top of the screen and hold down the Alt key. Then select the Library item that appears. You should see a Finder window display the contents of the user Library folder. Then open Application Support and inside that open then Jaksta folder.
There should be a file named "AppDatabase.sqlite3" in here - can you delete it or move it out of that folder. There will be a couple of similarly named files - don't worry about them. Then start up Jaksta again. It should be blank but otherwise working.
Let us know how it goes. I should respond a bit more quickly!
From Ben Graham @ 11 Nov 2016 16:11