I posted this in an old thread so it might have been lost.
There seems to be something wrong with playback of repeat bars for percussion in 5 bar percussion. staff format. I have a John Williams piece with al lot of repeat bars. They playback correctly for flutes, brass and string instruments but for a 5 line percussion staff with two toms the repeat bars stay silent.
In fact the whole repeat bar management for unpitched percussion instruments is weird. If you use single lines instead of a 5 bar staff the repeat bars play back correctly. If you then switch to a 5 bar percussion staff the repeat bars % disapear but the play back in the now empty bars continues to be be as desired. You can then re-enter the repeat bars and all looks and works as desired but that is of course a bit of a detour.
Maybe a known issue but also the dynamics entered in a 5 bar staff disappear when switching to single line format. However they seem to be maintained when they have been entered in the single line format and you switch to a 5 bar percussion staff.