This is the light bug: HowardForums: Your Mobile Phone Community & Resource - w580i Light Effects
It seems to only effect branded phones, R8BA024 firmware, and with my personal experience, R8BE001 firmware as well.
Basically its annoying bug in which the side lights on the w580i revert back to greenish-yellow (supposed to be orange) whenever you access the walkman player. The side lights are supposed to be controlled by the theme and/or the application you are using. Ok fine, so the lights turn greenish when you access walkman player. I can live with that. They are supposed to return, however, to the theme side light color. They don't but instead remain greenish until you re-apply the theme. This is the bug :(
EDIT: I flashed both R8BE001 MAIN and FS. It is possible something got screwie, i'll try to flash again and see if bug is fixed.
It makes me wonder though, what feedback (if any) do the SE software engineers create the firmware updates? I wish I could talk to one on the phone!!