This happens because there is no resource policy about the LPS logo image. So there is overwriting of logo images from different softwares attempting to use the LPS screen.

I will contact Billboard's author to manage it, like with InternetRadioPlayer. Just don't use NoStopPlayer (or any other multimedia player of mine) LPS plugins till then.

To clear the LPS just type this in a terminal, without quotes:
"gconftool-2 -t string -s /desktop/meego/screen_lock/low_power_mode/operator_logo /home/user/invalidstandby.png"

EDIT: I'll add option to disable LPS plugin as soon as possible, ofc.