Ok, so here is my take on this problem. I can recreate the issue by adding German keyboard layout. And I can confirm that using Ctrl+Shift++ or Ctrl+Shift+- does not work when German layout is on.
What does work in my case is:
- Ctrl+Shift+] = rotate clockwise
- Ctrl+Shift+/ = rotate counterclockwise
Note: I used German:Germany layout, not Austria,Switzerland or Luxembourg
However Ctrl+Shift+1 does not do anything in my case. And this makes me think that maybe actual keyboard controller on your German keyboard is behaving differently. Anyway - I would recommend you to first try all possible combinations involving Ctrl+Shift+Some Key and if you have no luck with that try installing English:US layout and see whether that works
I am using a laptop so I do not have dedicated num pad keys. I have figured out the option that works for me regardless of keyboard layout. I have num pad keys mapped accross the keyboad and accessable via Fn. Following combinations are valid:
- Fn+; = Numpad:-
- Fn+/ = Numpad:+
Having that said, following combinations work in Adobe reader regardless the layout. I have tested with German, English and Russian:
- Ctrl+Shift+Fn+; = rotate counterclockwise
- Ctrl+Shift+Fn+/ = rotate clockwise
So I recommend you to experiment with your numpad for better results.