If you're using Chrome and the Print Usernames and other buttons are not displaying, you can work around this by turning off Chrome's touch events feature. Here's how:
1. Open Chrome
2. Type chrome://flags/ in the address bar and press enter
3. Change the Touch Events API (or Enable Touch Events) setting to Disabled
Please note this disables touchscreen functionality on your device. If you need touchscreen functionality, temporarily disable touch, print your VizZle student list or lesson, then re-enable this feature.