If you are trying to copy and paste a URL into the YT downloader address field and cannot
AND you are running Webroot, the problem is caused by Webroot and this will fix the problem.
Add an exception for Song Surgeon, Video Surgeon, or Download Surgeon as follows:
Web Root >> Identity Protection >> Application Protection
In the application Protection tab add the following exceptions to mark them as "Allow"
C:\Program Files (x86)\Song Surgeon 4\SongSurgeon4.exe
C:\Program Files (x86)\Song Surgeon 4\SongSurgeon4reg.exe
C:\Program Files (x86)\Song Surgeon 4\run.exe
If Video Surgeon:
C:\Program Files (x86)\Video Surgeon 4\VideoSurgeon.exe
C:\Program Files (x86)\Video Surgeon\run.exe