Can you please start by doing a full reinstall of the app.
What you will need to do is delete the app (uninstall) from Applications instead of just reinstalling over it. Then in Finder go to the top menu and then access Go > (holding one of shift/alt/control/command) Library > Application Support > Jaksta Music Recorder and delete that folder (NOTE: doing this will erase your library file list in Jaksta, but your downloaded/converted files will remain intact). This folder and its files may already be deleted when the app is removed, but it's a good idea to double check and be thorough in case it remains and is reused when the app is reinstalled. Reboot the Mac and then do a reinstall of the latest version (https://www.jaksta.com/download/mac/jaksta-music-recorder) and it will regenerate a new copy of the deleted folder and the application files.
Start with that and then let us know if the problem continues.
If it does, please send through any screenshots, test files and links to videos/sites that give you this problem so that we can investigate.
Thanks for your guidance, After re-instal the app it start working fine.
After crashing 4 times my JMR is recording in fast forward and only capture segments os the song, my product is a fully activated version please advise.