problem adding track from singers disc

[Tela Harbold]

Help!! During my last show I ran into a problem with adding a track from singers disc. I click on CDG tab add the track #, singers and and song title then click on "Add track" button. Normally this starts the temporary import of the track. Not anymore! Now it shuts out the music and lyrics for the song that is being sang while I am trying to add the track. After about 5 seconds everything comes back and is playing like it never stopped. The track does import correctly though. Any thoughts on what is causing this problem. To keep from interupting the current singers song I have had to add tracks between songs which leads to longer wait times between singers.
I have upgrade all drivers and software and don't know where to go from here.