double-line barlines + repeat symbols don't appear in excerpts

in a file with several instruments, barlines that separate different piece parts from each other (double line - bar lines) don't appear in the single instrument excerpt. have to add it manually. same for dal segno heads. or they appear on wrong positions, like in the middle of a bar.
when going back into the main score with all instruments, the barline of that instrument where the barline was just added manually sometimes appears in wrong graphics.