A score creation with two instruments and linked staves is corrupted immediatly after entering a note
Nightly 37e54f6 / Windows7
First reported: https://musescore.org/en/node/66051
1) Via the wizard, create a score for flute. Or open this file (arrived before step 4): flute score.mscz
2 ) Add a linked staff
3) Repeat steps #1 et #2 to add a second flute score with a linked staff
4) Note input mode -> entering a note in the top staff
Result: corruption (the rests in the second flute score disappears). After save-reload, ditto, with a warning.