The PrintJob class has no idea if other scripts are in the middle of something when it makes its synchronous call to the system, nor should it. PrintJob can't make sure that there are no other scripts in the middle of anything when it tells the browser to open a print dialog. It does what it's told to do. It's up to the coder to make sure there isn't code that would be adversely affected by Flash making a synchronous call.
Actually, I don't really get your point here. Because Flash is single-threaded, it doesn't really mean anything to talk about 'scripts in the middle of anything'. There's precisely one script at any one time that's in the middle of anything. The size of the call stack should be neither here nor there when Flash is deciding if it's hanging.
Danny
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