Longtime lurker, but finally joined just so I could post to this thread. I've tried the same directions that ok2uselane posted multiple times, but the Asiana website always gives me the following error:

ERROR1010
You will be able to check-in online after you purchase a ticket for this booking.

This is for an award ticket originally made via the Continental website in January (005 ticket stock).

The error message scared me enough to contact the Asiana ticket office in Los Angeles. They were able to pull up my reservation and told me my seat had been assigned to 2D. Not sure why I can't view the reservation myself. Still a bit unnerved by it given all the problems that people have been having with their United partner award reservations disappearing.