See this link for instructions on how to save a pdf copy of your tax return. Once you have saved your pdf copy, you should be able to print your tax return out.
If these steps do not assist, and you are using TurboTax online, try clearing your cache and see if that helps.
If you are using the desktop product, make sure your program is updated. This can be done by logging into your desktop product. Select Online in the menu on the top, and then select Check for Updates.