I don't think this is a PC or a Mac or what it's running on issue. This is a turbotax issue, crappy code and lack of quality control. I have had 2 updates since and yet there's no acknowledgement of a problem or a fix. I submitted my taxes already (couldn't wait for them to fix) while dealing with continuous crashes. I really should return this but I did use the software (with lots of pain). No one reads this guys, we're on our own. Good luck, deal with the problems and use something else next year.