The way Dorico deals with players and instruments is brilliant in principle, but I’ve come across a situation where it seems to concatenate multirests across rehearsal marks and key signature changes. I attach a short extract that illustrates the problem (instrument change problem v1). Clarinet 3 is Bb clarinet doubling bass clarinet and Dorico concatenates bars 42 to 63, rather than breaking the multirest at 43 for letter 2 and 48 for letter 3. Similarly it concatenates 128-130 ignoring the rehearsal mark, double bar and key change at 129. It’s possible to work round by inserting system breaks at bars 43/129 but that’s less than ideal and in more complex cases will take quite a bit of messing around to produce a useable result.
Unsurprisingly, if I cut and paste all the notes onto one part there is no problem. I haven’t bothered attaching this. Weirdly though, if I do this for the first bass clarinet entry only (bars 20-41), Dorico concatenates bars 97-125 and ignores the rehearsal mark etc at 117 despite there being no instrument change until after 127 (instrument change problem v3).
The music did originate from an xml import, but (I think) I’ve reset everything that possibly could be reset. I shall of course be delighted to discover this is simple operator error and to know what I did wrong.
Leaving this issue aside, I think the extract also shows how, as others have said, it would be useful (?essential) to be able to move instrument change notifications individually in engrave mode. There is often more space below the staff and/or in the bar before the new instrument plays. For example the Bb clarinet entry at bar 126 where I’d suggest it would be more convenient underneath the multirest immediately preceding the entry.