If you open 4.0 any time before opening 3.4 it sets the SND (Singers Name Display) "on" which is a black background with white letters list the upcoming singers and their songs from the playlist. Remember this from 3.321 and earlier versions? It does not have anything to do with the lyrics display. It is 4.0 that is resetting it to "On"
Either go to Tools/ Singers display and uncheck the box to show it or double click on the black box to send it to your secondary display where it will hide behind the lyrics display.

I'm glad you now have 4.0 working. Think I am going to try re-installing DirectX too and see if it will cure my lag. Could be I have fooled with the settings too much. It certainly won't hurt.

singers display in 3.4
 

ddouglass
your right again when you uncheck singers name display the box will no longer be there.
thks northlander.