Missing Autoscroll in Score Editor

I own Cubase 6 licence.
In score editor, the autoscroll feature does not work, simply. It started missing a couple of days ago, and I’m not able to work in score editor (it is very important for me).
Any help will be really appreciated

Hi, I know this post is old, but did you ever figure what the issue was regarding the missing autoscroll bar on the score view? I just bought cubase 8.5 pro for the scoring capability and now this? Thanks in advance