Problem with Favorite You Tube videos

[Myron]

I recently synched my old iPhone 3G to my new iPhone 5. I got the You Tube App but my account states that I have no favorites. With my old phone, I have over 600 favorites. Why won't these videos transfer to my new phone? My account name and password have not changed. Any advice? The 600 videos still remain on my PC but were never synched to my new phone.