It seems that there's a bug on the Mac when printing via 
The Printing from Flash on a Mac: why so blue? article by Aral Balkan, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial 2.0 UK: England License.
PrintJob from the Flash IDE on OS X: your printouts end up with a blue tint (at least that's what I'm getting when I print to PDF).
Others apparently have also run into this so I'm ruling out some weirdness with my setup (the workaround, according to this article, is to test your app from the browser).
My guess for the reason is that the Flash IDE is speaking ARGB and OS X is hearing RGBA.
The Printing from Flash on a Mac: why so blue? article by Aral Balkan, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial 2.0 UK: England License.
I remember getting black background behind everything that was transparent. But that happened on both Mac and Windows at random moments, when printing from Flash embedded in a web page. One way to fix it could be to put a solid white square behind every print job. But not every elegant, I agree.
I think printing needs looking at in Flash 11.
I find it irritating having to draw a white background behind every print job so the background colour of your app (Flex Grey if u don’t change it) doesn’t get printed behind everything transparent.
Also, knowing how many colours the printer is going to use to render your work would be useful (ie, grey scale / black / colour). Oh, and knowing the paper size or DPI would be useful too.
OMG. I thought I was the only one. I figured out the white rectangle workaround a long time ago; yet, I just figured I was doing something wrong; thank goodness its not me, and that it is just Adobe that sucks.
I am on windows vista (unfortunetly).
They need to fix this now, never mind flash 11; for, when even when I try to export a png from the flash IDE the background of my text goes black if over an area that is transparent. It seems it is a problem with flash’s/and the flashplayer’s ability to convert to other image formats properly before printing.
Thank you for posting this. I thought I was going crazy. This bug also seems to force PrintJob to always print in bitmap mode no matter what as well as the blue tint…
Yeah, printing from Flash still involves a bit of Voodoo magic. It really shouldn’t be this quirky.
I too have repeatedly come across the following bugs …
1) Blue printouts (when printing to PDF) from local SWF on Mac OSX.
2) Printing as bitmap on local SWF with Mac OSX, even when printAsBitmap = false
3) Stage colours showing through and being printed as the background colour.
Adobe, please make this less quirky!!