These is the error that appear
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at YT_Masthead_970x250_child_fla::MainTimeline/onFrameEnter()
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at YT_Masthead_970x250_child_fla::MainTimeline/onFrameEnter()
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at YT_Masthead_970x250_child_fla::MainTimeline/onFrameEnter()
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at YT_Masthead_970x250_child_fla::MainTimeline/onFrameEnter()
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at YT_Masthead_970x250_child_fla::MainTimeline/onFrameEnter()
I have to assume that the errors are pointing at the lines where you are targeting the different players. The 1009 error indicates that an object you are targeting does not exist as far as the code sees it - it looks like that's true for a number of the players you target. If those players are not present in the frame where that code executes you will get that error.
You should go into your Flash Publish Settings and select the option to Permit Debugging. That won't solve the problem but it will enhance the error messages to include the line numbers where the errors are occuring