Jitter is currently optimized to run on the latest version of Google Chrome for desktop.
If you are using Jitter from a phone, tablet, or from another browser, please try again with Chrome on your computer.
If the issue persists, try to empty the cache of your browser:
Open Chrome's developer tools: right click anywhere on the page and select "Inspect".
Right click on the refresh button of your browser and select "Empty cache and hard reload"
Close the developer tools.