I am using QT ver 7.5 with OS 10.3.9 and I always install software updates. All of a sudden I can't open QT videos in emails, I get the question mark inside the Q and the message says "additional software is needed...check the QT website". So I have checked, and done a reinstall, and installed add-ons and nothing works. Do I need to reload an older version of QT software to fix this? What version is best?