Hello Herbert,
I'm picking up this thread, as Sherry is a music camp now for 5 fun days.
I definitely see the problem in your Schubert .not file.
I was able to recreate the problem from scratch in two steps:
forum14462-1.jpg
Hit the equal sign "=" key to add the ties. Then the problem shows:
forum14462-2.jpg
I'll fix this in an upcoming 2.6.1 maintenance release. This is task #2327. So far, this is only one of two bugs scheduled for fixing in the 2.6.1 maintenance release.
Cheers
-- Mark