Hi Trevor,
> You ever have the "tr." parts of your trill spanners start showing
> up too far to the left?
> [...] Ever seen this one before?
Yes!
Unfortunately, like your case, mine were in the middle of a large
score -- the chamber opera I wrote last year -- and so I never got
around to isolating a minimal bug-snippet-example.
I've found it: strick trill spanners on to some notes in staff 1; then add a second staff within a grand staff or piano staff or staff group or some other containing structure so that staves 1 & 2 are now contained together; trill spanners will be fine at this point; BUT THEN add some fat dynamics to notes *in staff 2* (yes, this is utterly bizarre); and guess what? The trill spanners in the staff will move to the left to align with the dynamics sitting on notes in staff 2!
I'll post a minimal snippet and request an ID from Valentin after lunch.
(This is truly bizarre -- first one I've seen with what might be called "context-interference".)
Kieren, if you have a copy of the chamber opera handy, could you check and see if your too-far-left trill spanners are, in fact, sitting inside a staff group and adjusting relative to dynamics in remote staves within that group? Just a quick visual check?