For those of you using flash in jit.qt.movie, if you download the
latest version of QuickTime, it looks like you’ll need to somehow
enable flash support manually in your QT preferences. I personally
haven’t downloaded yet, or looked into any potential ways to override
this setting programmatically from Jitter, but we’ll check it out.
Kind of bogus, but not terribly surprising.

http://www.oreillynet.com/mac/blog/2006/09/
surprise_quicktime_713_disable.html?CMP=OTC-13IV03560550&ATT=Surprise
+QuickTime+7+1+3+Disables+its+Own+Flash+Support

-Joshua