The bug takes place in the game's third sector (aka the lava section) after squaring off a room of spiked enemies with purple legs. If, in this section, users decide to backtrack towards the area where the Ice Beam is obtained, a door that is supposed to unlock remains closed and will not allow players to continue through Samus' latest adventure. To avoid the issue, Nintendo recommends going through the door immediately after defeating the enemies and do any desired backtracking at a later time.
Nintendo of America and Nintendo of Japan have also set up an interesting approach to fixing the issue for players who have already been hit with the bug. Players are invited save their affected data on an SD card and send it to Nintendo for service. Sadly, snail mail is the only option available to users as the Nintendo Wii does not have the necessary online software framework in place to patch the glitch.
A video detailing the issue can be found after the break. Stamps can be found at your local post office.