It seems that people with Sony Blu-ray players and PS3s have been experiencing problems with the latest firmware update when trying to watch Sunshine.
It mentions in this link that the picture-in-picture track opens automatically and can't be turned off.
Blu-ray consumers in the US and Canada can call this number for a replacement copy of Sunshine.
That being said, I just updated my Sony BDP-S360 with the latest software update and am experiencing no problems with my Sunshine disc. It started normally, I opened the on-screen menu, turned on the PIP track, and turned it back off.