Thanks Bruno, once again you saved the day.
The ''Karaoke - Line scroll'' menu was activated.
I dont know why it was activated but in future I’ll know what to do.
I have tried different songs with the Line sroll disactivated and everything works fine.
With the Line scroll activated some song scroll line by line and some other stop scrolling at the bottom of the page.
Anyway it works great for me with the Line scroll disactivated.
But I just found the cause why some songs stop scrolling at the bottom of the page.
When I started to use Qmidi a couple of years ago I was putting the chords on top of lyrics(with a smaller font) like a song book.
Much easier to follow in a live situation; the drawback was when you wanted to transpose, the chords would the stay the same.
Now I use the chords sync
It’s with some of those songs that the problem appears if the line scroll is activated, and not all of them.
I’ll keep investigating.