I am operating the Jaksta Media Recorder for MAC
Can you say whether you see this problem with all sites, or only lynda.com? Does Youtube still work?
Can you say what version of OS X you have? There is currently a problem with macOS Sierra and Jaksta:
This was working fine last month. Now - I click a video and it won't play if Jaksta is actively monitoring. Once I turn-off the active monitoring the video will play. Please advise the fix.