For some reason, there seems to be a persistent problem between Civ4 and QuickTime Player when both are open: after a few turns, all the ambient music, most of the sound effects, and the Nimoy voiceovers do not play, and the tech screen that shows up whenever a new tech is researched does not appear. Furthermore, more turns later Civ4 freezes and/or unexpectedly quits, and Civ4 will not relaunch unless you quit QuickTime player (in fact, it crashes on launch, and quitting QuickTime Player seems to be the only workaround.

Any of you having this problem?

For some reason, there seems to be a persistent problem between Civ4 and QuickTime Player when both are open: after a few turns, all the ambient music, most of the sound effects, and the Nimoy voiceovers do not play, and the tech screen that shows up whenever a new tech is researched does not appear. Furthermore, more turns later Civ4 freezes and/or unexpectedly quits, and Civ4 will not relaunch unless you quit QuickTime player (in fact, it crashes on launch, and quitting QuickTime Player seems to be the only workaround.

Any of you having this problem?

I experience most of the problems you are having without running QuickTime, so I don't know if that is the problem.