How can I view my returns before filing in final step? A window pops up and states, "Preparing your documents. This may take a moment." I waited over 30 min. HELP!?

I am trying to look at my returns before I file. I have done this every year. Now, they won't show. A window pops up and states, "Preparing your documents. This may take a moment." I've waited for 30 minutes and nothing.