I got my Titanic Explorer today. Paul, you are right, I had an older version of QT on my new machine (to run some other older Titanic CD's) and Explorer totally crapped out. So I removed all of the older versions of QT and am just running 6.02 and the cd's are working just beautifully.
Eric, you are so right, I am enjoying this more that Titanic Challenger. And this one basically works all the time. I have noticed that there are some small navigation problems but it is a well made set. Makes you feel like you are watching a documentary. There are some many deleted scenes that Cameron should consider putting in a Directors Cut DVD Set.
James, if your set is freezing up (like mine did) update your QuickTime. I also noticed another thing that will make it freeze. You need a lot of RAM. I did notice it takes up more than 30mb of RAM. I checked my RAM meter (and I have 256 K RAM) and found that this set caches a lot of memory. So if you are limited on RAM, then turn off anything that shows up in the System Tray to clear out memory then try it again.