When the cartoon starts, the picture might appear slightly fuzzy - but please be patient.  The picture quality will improve in seconds.  It can be improved yet further (in some cases to HD quality) if you click on the cog in the control panel and make the necessary alterations.  If you click on the [ ] shape on the bottom right of the display you will be able to watch the episode in Full Screen (to leave Full Screen, click on the crosshair shape in the same corner).