Apple has released QuickTime 7.6.6 today for Mac OS X 10.5 and all versions of Windows
(Note: at this time, there is no 7.6.6 for OS X 10.6 Snow Leopard or OS X 10.4).
We recommend all iScreensaver users on Windows PCs (XP, Vista, Windows 7) upgrade, as QT766 fixes some crasher bugs having to do with movie playback.
Download: http://www.apple.com/quicktime/download/
Info: http://support.apple.com/kb/HT4008
Screensaver authors should set the Plugin Version Checking string to “7.6.6” if you are delivering QuickTime content.
See this for more info:
http://iscreensaver.com/help/help11.shtml#pluginCheck
FYI: quicktime 7.6.6 is included within the mac os x 10.6.3 update – so if you request “7.6.6” for the quicktime version, this will work. If a person is still using 10.6.2, then they will be directed to the quicktime update site (which may be a little confusing). Apple seems to have made this change (no longer including QuickTime as a separate download for 10.6) at the last minute. We will look into updating our software to behave differently if this trend continues.