Individual computers sometimes save certain aspects of the web application directly on that computer's hard drive. If changes are made to the system at the server level (such as during a version update), the changes are sometimes not reflected on an individual computer because of this. The computer will still try to connect to the server with the older version of Summit which was stored locally, which can cause error popups. 
To correct the issue, you must clear out all the old saved information so the computer can fully reload Summit using the updated version.

Here are the steps to do this.

  1. With Summit open in Chrome, press the Ctrl + Shift + i buttons on your keyboard at the same time. You can also right-click in the browser window and select Inspect from the list.
  2. You should see a console window appear in Chrome similar to the one in the screenshot below.
  3. Navigate to the Application tab and click Local Storage to expand the menu. Locate your Summit URL and right-click. Choose Clear.
  4. With the console still open, right-click on the reload/refresh button in Chrome. You should see an option labeled Empty Cache and Hard Reload. Clicking on that option will clear any locally saved information related to Summit and pull the most up-to-date information directly from the server.

If you run into any further difficulties, please let us know.