@srmatthews2 - Sorry to hear about the trouble! I checked out the Invoices tab of your Square Dashboard and didn't run into any issues myself. This makes me think that this problem is isolated to your internet browser. Try out these troubleshooting steps: 

• Restart your computer
• Clear the cache on your browser. Instructions for clearing your cache will vary depending on your browser. Accessing the Help menu on your browser should allow you to locate step-by-step instructions
• Switch to a different browser: Google Chrome, Safari, Mozilla Firefox or Internet Explorer 10

Hope this helps!