Hi Erin, 

Welcome to the Box Community, I'm happy to help!

To make sure that every angle is checked, could you try the following initial troubleshooting tips to resolve this issue:

• Can you try to clear cache and cookies for your browser. Here is an article that walks through how to do this on the different browsers that Box supports.


• Login to Box.com using different browsers (or incognito) and see if you can open your files with no issue


• Try disabling your browser add-ins/ extensions  
  


• Connect to other networks to see if it helps


• Try disabling your firewall and see if you can open your files 

If the issue persists, please let us know so we can further investigate!

All the Best,