I know that the octave lines already gave problems in the past with other objects, but now also when trying to place fingerings below octave lines. The fingerings are being positioned above the octave lines which brings them far above the note itself in some cases. Is there a way to prevent this? I could not find a setting for this:
Yes:
I think it would be a good idea to make these seperate options. You might want to keep fingerins outside slurs but not outside octave lines.
I already use this setting, but the fingering still appears above the octave line.
Hm. Sounds like a bug to me. Can you post the project?
Here is a single page with 3 bars, you can see how some (not all!) fingerings sit above the octave line. Why only those, I wonder now.
Moments for piano_02-10-2017 - Test.dorico.zip (225 KB)
Those fingerings also coincide with the starts and ends of slurs, and it’s currently only feasible for us to have a single option for whether fingerings go inside or outside all of slurs, octave lines, and tuplets. If you select that fingering and set the Slur-relative position property to Inside then you’ll find that the fingering then goes inside the end of the slur.
Basically for some combinations of these items, for the time being some manual positioning will be required. Hopefully at some point in the future this can be improved, but it will not be a simple job.
This works perfect, thanks Daniel.
I would like to suggest that the fingering in the sample be changed to 5 4 3 2. As shown (5 3 2 1), the fingering can hardly be called idiomatic.
Marc, what a funny observation. After looking at it though, I agree. 
(cue Dorico development team eye rolls 
)