Strange. Nothing major in the last update that I can think of that would be affecting your machines performance.
Lets start by uploading your debug logs when you try to copy & paste a youtube video link.
Follow these instructions: https://support.jaksta.com/discussions/topics/6000009063
Updated my existing Jaksta Media Recorder for Windows to the latest Jaksta \Media Recorder 188.8.131.52 For Windows ( was prompted to do so) and there are 2 problems
1) Does not download any video from any site ...tried youtube etc . Tried copypasting the video links, changing the output format to mp4 , no conversion , flv , changed it to auto mode etc .. nothing works
2) Once the Jaksta is open , my desktop slows down and doesn't open other tabs as fast as it did without it.
Wishing that I did not update ... please help !!