10.39/QT 7.04/iTunes 6.02 here:
Followed the downgrade link;
Even before the installer finished downgrading QT I opened MacMame successfully. (I was bored)
.074 would open under 7.04.. 7.03 works after re-upgrading QT. .074/.057 still best speed for um, classic programs. . but that's OT.
iTunes 6.02=no difference, but then I didn't install it normally (extracted from installer)