was it easy check-in or easy check-in on-line???

the reason i ask is that last week, i was flying w/a sponsored cr1 and the u/g was waitlisted. i was able to check in on-line the night before and got my bp and dm card but when the u/g cleared at noon on the day of flight, i got curious and tried to check-in again. i saw the itinerary and was able to go thru the motions until i hit "check in"-that's when i got the same error message metnioned above. when i got to sfo, i went to an agent and was checked in with no problems or "ssss's".