ektorp
Community Answers
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ektorp's post in A very newbie question: when 'x' works and 'left' does not. was marked as the answer
This is a recent duplicate issue as you can see below. Basically, setting the 'left' property requires setting it's 'position' property as well while using transforms such as 'x' do not require a 'position' setting.
Rodrigo sums it up pretty well:
http://greensock.com/forums/topic/12374-having-trouble-animating-a-jpg/