I had this same problem, called TurboTax, and they were no help. They told me to uninstall and reinstall the program. But I found a much quicker fix.
Mac apps are supposed to use the system for print settings. If you select Page Setup… from the File menu in TurboTax it probably says "Any Printer." That should work, but it doesn't with TurboTax (at least not unless they have fixed it by the time you are reading this). Your Mac goes off into la-la land, and the system reports the application is not responding. Basically, what is happening is the software is asking for information from the system in a way Apple no longer supports, so it just sits there, waiting for an answer that will never come. That answer has to do with identifying the printer to which the job should be sent.
So here's the fix:
1. Select Page Setup… from the File menu in TurboTax.
2. Select the name of the printer to which you want to print from the pop-down menu, replacing "Any Printer."
That should fix the problem.
