Sorry for creating the same thread in the bug forums, but since this seems a bug...
Maybe the mods can delete the old one:
https://forum.cockos.com/showthread....to_threadtools
I created a cycle action to show only tracks that are inside the Woodwind, Brass, Percussion and Strings folder. However, when I trigger the actions, the scroll bar zoom is not adjusted correctly. The navigator shows the correct zoom level in relation to the window, though.