8/8/2015 8:08 AM
Stephen;
I had an issue with you tube displaying full page except for the video intended. If you are using "edge" that may be the problem because I did not have an issue doing the same using Google. I went to three dots upper right, settings, choose what to clear, browsing history, cookies and saved website data and cached data and files are in blue and checked-if so, click onto clear and try again. If not, ask Cortana below your specific question if it's an issue that is beyond what I suggested.
good luck, Stephen
Kenneth B. Rue
K E N T U C K Y