Follow the steps below if you are using a Macbook Pro and YNAB is crashing on startup:
The crash is due to a graphics bug in Mac OS X Lion 10.7.2. Apple and Adobe are working together on a fix. For more information about the specific models affected as well as a screenshot illustrating the option mentioned above, check out this article on the Apple support site.
If you don't have that option available on your Mac or you're still experiencing crashes after following the outlined steps then please let us know!