Lines - Decres. and Cres
Further to previous post I was looking at this again and now figure that the line jumping to the next line of the stafff is not a bug but useful (there appears to be no other way to make them extend to the next line) .
If you click and and drag so the line attaches itself to a note in any measure except the last one it works fine.
After playing around for a while I've found that if you attach by clicking and dragging to the last measure (except last note) in a staff line it wraps around. This is good.
But if I attach to the last note in the last measure the part of the line that is staying with the original last note in last measure reverses itself. (see attached PDF and Musescore file).
You can double click and enter edit mode to make go the right way (but a bit wrong to my way of thinking).