Major Problem with Read More
Using Jamroom
IF you are using site builder...
A workaround for the YT videos might be to use the url from the video at YT- then go to your profile and select YT videos tab- then add the url there and save....
Then you can open the blog in the sitebuilder widget and use the editor embed function to select the YT video and embed it..
I am not sure what you are using to place the blogs in the page with the "trunicate" but you may need to add the "truncate |Read More" code to your template..I cannot recall what that code looks like but someone here maybe able to help
Embedding the YT videos with iframe should work if you have "Enable all html Tags" check box checked...and the youtube domain allowed in the " allowed domains area"