Can you try reinstalling the latest version from here:
If you still get the same problem, can you send us the log file? Unfortunately it's harder to find if Jaksta is crashing on startup. You can find it here:
(your home area)/Library/Logs/Jaksta.log
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.
From Ben Graham @ 17 Sep 2015 14:09