I don’t know if you are still having this problem but I just found the answer.
Go to: Settings | Media | then clear “Attempt to automatically embed all plain text URLs” and increase the Maximum embed size to something bigger then you would need.
Also if you have “Video Embeder plugin” increase the default size and that should take care of the problem.
EMC2, A thousand thank youzzzzzzz for the tip on the user name and password. May you live the life that other’s only dream of. Thanks again, Kim