See if reverting to 10.6.6 solves this. There is a known issue with the 10.6.7 update and certain fonts. I'm guessing this may apply to printing from Turbo Tax. The 10.6.6 is free of this problem
http://discussions.apple.com/message.jspa?messageID=13295716#13295716
To do this you must choose Reinstall from the Install DVD. This will give you new system files while keeping everything else in place. Then update using the 10.6.6 Combo update.
Before updating, open Disk Utility for the volume (indented below the Disk name) and choose Verify Disk. If it reports any problems, you will need to Repair the disk booted from the Install DVD. Also repair Permissions booted normally before and after running the update. Check Software Update for any other updates you may need to run after reinstalling.
http://support.apple.com/kb/dl1349
(Reinstalling shouldn't cause any problems, but I would have a backup, either a clone or a Time Machine before doing this, just in case. You should always maintain a reliable backup, anyway.)
Message was edited by: WZZZ