If a tool in Canvas is not functioning properly, or Canvas does not appear as normal:

1. Make sure your Google Chrome browser is up-to-date. 

2. Clear the browser cache:

1. Open Chrome.
2. In the address bar, type (or copy/paste) the following: chrome://settings/clearBrowserData 
3. At the top, choose a time range. To delete everything, select All time.
4. Next to "Cached images and files," check the boxes.
5. Click Clear data.