Zooming the timeline by the shortcuts (keystrokes '+' / '-') don't work if you mark a clip or a title in the timeline and the library view changes by the new marking.
Select in the library panel the effect or title view. Mark a clip and the library panel changes to clip view.
Now the shortcut for zooming "keystroke +" or "Keystroke -" don't work.
Now mark another clip in the timeline where the library view don't change, the shortcuts work.
Mark a clip first and then mark a title in the timeline. Because the library view changed shortcut for zoom don't work.
Mark another title. Now the library view don't change and the shortcut work again.
I think a lot of users have noticed this bug and I hope there will come a patch soon.