The cookie we place in your browser is how we identify your device / browser. For best results, do not browse in Private Mode / Incognito. Do not delete or purge your cookies (whether when you close your browser or click to purge them every time on exit). In either case, this consumes one of your allotted devices. Each time we have to replace this cookie, we are counting that as a new device, which can cause you to run through your allotted devices quickly.
For the optimal playback experience on a Mac, we recommend the Safari Browser. For Windows, we recommend Chrome, depending on your configuration though, other browsers such as IE or Firefox may work as well.
Additional information is available in the Help section