Two small(ish) BTTF issues

edited January 2011 in Game Support
I'm using Mac OS X (10.6.6) and there's these two things:

1)When launching the game, the music starts playing but the screen shows random stuff, apparently from a buffer. There are pieces of windows I just closed and my desktop etc. 2-3 seconds later it shows the Delorean in the car park. I'm guessing I'm either somehow missing a scene before that or the first few seconds of that one.

2)Whenever bright light is supposed to appear on screen (examples, with some spoilers:
The Delorean travels while Marty shoots the video, or near the end when the camera pans to the street and the car with Kid and the Doc appears
) the screen freezes for a few seconds and then "jumps" to the correct frame where the light is still on but no more slowdown happens.

Both things happen even if I lower the graphic detail to the lowest setting. I'm using a recent imac (bought on November).
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