The link below outlines an issue that exists for some Flash Pro CC users on Mac attempting to embed assets.
The issue seems to be related to some kind of installation glitch as the same code complied in CS6 or CC on Windows will compile fine.
One thing I have noticed but not sure is relevant is the reference to the variable has an underscore added to it.
e.g.
Access of undefined property Assets_BgWelcome.
If this was working correctly, BgWelcome is a public staic const you would access this variable with Assets.BgWelcome.
If anyone has any suggestions on how to fix this please post them here, hopefully before I pull the last bits of my hair out!!!
Thanks,
Mark