Can any explain why this is happening, and how to correct it?

This could be the result of differing issues by themselves or in combination. You may be having a bandwidth issue make certain nothing else is attempting to connect when you are trying to view a streaming video. A software/video driver issue - make certain your video drivers are up to date and make certain you have up to date versions of java for your browser. Were you able to view previous eps online at cbs.com?