8vb in the wrong direction
The 8va bassa in the palette is provided with a hook in the wrong direction; I think this sign is always below the note, and the hook should be upward (see my screen capture).
Maybe there is a way to change the direction of the hook?
By the way, in my version, if I change the stem directions in the layers section, it doesn't remain after I click on OK. The same with Apply, then OK then come back to the window in question. (see capture)
Kubuntu 9.04 beta
MuseScore 0.9.5 rev 1698