First of all, I would recommend doing a full reinstall. That means uninstalling the current program, rebooting the machine and then reinstalling the program. There is quite a bit going on there, so there might be a break in the apps processes, which a reinstall should reset.
Start with that and then let us know if the problem continues.
If it does, I will get you to send through a crash log file, which can be found by opening Console and then going to ~/Library/Logs/Diagnostic Reports, and then select the latest one for Jaksta Media Recorder.
From Liam @ 03 May 2017 15:05