I tried to drag a midi track (belonging to another Live set) to a track in a new Live set -> this results in Live 6.0.5 quitting everytime. The reason for this I reckon is the respective midi track is frozen in the original Live set, so it displays as a midi track (with midi clips) in Live's browser when really it's a frozen track.
Anyway, although it would be cool to be able to rip midi clips from frozen tracks (it can be done in session/arrangement view, but not from the browser apparently), at least Live should display an error message and not just quit instantly
(iBook G4, 1.33 Ghz)
P.S.: sorry if this has been reported before, i didn't find anything upon a quick search...