A few:
http://forums.adobe.com/message/4217410#4217410
http://forums.adobe.com/message/4573064#4573064
http://forums.adobe.com/message/2537945#2537945
http://forums.adobe.com/message/1790562#1790562
Google search: Adobe quicktime gamma
(If you preface a web search with 'Adobe',
you are more likely to get returns from Adobe forums.)