IDK which EPG you are saying has been missing data for months but I just checked yahyabell and it shows current as of today's date. Try using viper's url and clearing data for EPG in Simple Client again. I read a while back that one of the users who was providing guides has quit using the service and is not updating any longer, think it was Pach.
Creating you own guide is not a terribly big adventure. Give it a try and you won't be dependent on anyone.