Didn't fix any of my issues: constant (meaning 95% of the time I watch video of any format, via various players, i.e., browser, Q-time, MPlayerX, VLC) system freezes (audio typically continues, but no mouse/KB input is accepted; have to hold down power button to shut down) or black screens; weird graphical glitches which precede system freezes/panics. These tend to necessitate repeated re-starts before things settle down.
:shrug: I wasn't really expecting a "fix" since my machine is so old--late 2006 MBP--, but was hoping anyway. Wish I could afford a new machine, but the last couple of years have been rough.