Starting the appimage "MuseScoreNightly-201806281508-2.3-f6b55d7-x86_64.AppImage" on fedora28/x86_64 produces a segfault
Jack appears to be installed on this system, so we'll use it.
initScoreFonts 0x3015280
QDir::mkpath: Empty or null file name
QDir::mkpath: Empty or null file name
QDir::mkpath: Empty or null file name
QDir::mkpath: Empty or null file name
libpng warning: iCCP: known incorrect sRGB profile
/tmp/.mount_haJW2M/AppRun: line 28: 25924 Segmentation fault (core dumped) "${APPDIR}/bin/mscore-portable-nightly" "$@"
This can be simply reproduced.