Have you tried clearing your cache and cookies?
A full or corrupted cache can cause problems in TurboTax, so sometimes you need to clear your cache (that is, remove these temporary files).
Here are the official instructions for the most popular browsers:
Each browser has a slightly different method for deleting cookies. Choose the browser you're using:
TurboTax FAQ: How to clear your cache
TurboTax FAQ: How do I delete cookies?