MAG254 Help

Hey folks, im fairly new at this iptv thing. I have a Mag254 and im having troubles getting ANY IPTV channels! I had them working before by adding lists and messing around, but now I cant seem to get any channels to work. Even tried adding the newest lists i could find in this forum but with no luck. Im wondering if I have a setting wrong or if all channels arent working for anyone or what my problem is. Any help or ideas would be appreciated, thanks!