I just purchased a Samsung BD-JM57C/ZA and Opera TV Store is giving me the same error:

""We are sorry but your device is not supported (err:496)"

And then it hangs my system forcing me to unplug it from the wall.

This is extremely annoying since this blu-ray player is listed in the support list:
http://forums.opera.com/topic/1957/opera-tv-store-retail-device-list

I've got about 30 days to return it...