Hi Torben, Just something I have noticed with the Playlist Error Checker. Basically if your hour is generated and it contains an under-run but the end of the hour is met e.g. there is a bumper at the end of the hour with a hardfixed time it will not detect the presence of the under run within the playlist. any chance that this can be changed so that if there is any under run from any sort of fixed time it will be detected by the error checker as it would be considered an error if there was not enough music generated.