Sorry for the delay in my reply! Hope it's not too late for your project.
It looks like you are using an older version - a beta of the new capturing system before we got it working properly. Can you try downloading the latest version of Jaksta from here:
Make sure you leave the Jaksta app in your Applications folder and make sure you are running the new version that you have installed - you should be able to go to About Jaksta in the menu and verify that it's version 1.4.4.
I lately reinstalled Jaksta on my Mac after having it reset to factory settings... I have been unable to stream from youtube on either safari or firefox.. Can you help please? I need some important videos for my class project..