As I didn't get an answer here, I submitted the problem to the
Finale support and after some mails, they confirmed the issue,
which means:
"Custom text" techniques in human playback cause
problems with key switches following afterwards.
After the first appearance of a custom text technique
no more
Most instrument techniques (staccato, slurs, sustained, pizz, arco) work
fine in my Finale 2012/Windows together with Garritan and Vienna Special
Edition sounds.
But when using special techniques like Sforzato (defined as "Custom
text: Sfz"
in human playback), they are played correctly,
but for
