iPod need help on why my Ipod wont play videos anymore

[SuperSayjin]

I have the 30gb Video Ipod and the last few months it hasn't aloud me to put videos on it. It wont tell me anything it just wont do it. Now I do have a few unreleased Limp Bizkit Songs from youtube on there that it originally played with the video, but I didnt want that and when I put them in a playlist with other unreleased songs from the band it asked me if I wanted to mix videos with non video or however it stated it and I said yes. Well a few months ago I tried to put some videos on there and it would not acknowledge that I was even trying to do anything and when I play the music videos I all ready have on there it will just play the song, but if I play them when I have it hooked up to iTunes it will play the video. I'm just curious to if I have to get rid of the songs that I have in video format to get it to play videos again or what?