Just to alleviate some of the complains on this thread. There is a very simple procedure for troubleshooting playlists issues.
1.- Enable nextsong debug, under settings > advanced
2.- Reproduce the issue
3.- Look at the station logs
4.- Turn off nextsong debug (as it generates heavy log files)
If you need help interpreting the logs, or you think there is a problem with the track selection method, you can open a ticket to our support department, providing the following information.
1.- An attachment (in zip or tar.gz format) with the full station logs.
2.- The exact portion of the log that you think reflects an error
3.- Login details to the affected station, so that our staff can verify your playlist set configuration
Please bare in mind that you will need to be prepared to NOT modify your playlist set for the duration of your inquiry, otherwise it would be very difficult for our staff to help, and you will likely be asked to re-do the test.
Of course, end-users will have to forward this information through their respective streaming providers.
Regards.