can you please tell exactly what is the error? does this happen every time or only with some songs?
It happened with Oasis - Wonderwall
The song played through, the karaoke worked well, but when it finish and winamp starts playing the next song, EL try to submit the karaoke file to your server (And as far as I know it is already on your server). Then It gives me a run-time error '13': Type mismatch. I have to ctrl alt del to close it. It is still running in the task manager, but it isn't doin' anything. Can't even close it normaly.
Another thing I noticed is that when you move forward with a song to listen to a part closer to the end, the karaoke doesn't follow. It keeps on going as if still in the beginning.