Mac users might see the side bars flash quickly when playing a 3D activity but only after resizing the window. This is only seen on the Imagine Learning legacy app.
Users are encouraged to use our new app, https://app.imaginelearning.com. If the Imagine Learning legacy app must be used, users should set the window size before logging in as a student. If the flashing bars appear during a student session, attempt to resize the window or relaunch the app.