I had the same result the last 2 days. I was upgraded and could not do OLCI or find my itinerary. When I tried to change seats during check in instead of the seat map it displayed error. When I saved and continued, it looked like I would be able to check in, but when I tried it then again told me it was unavailable.
I also tried to change itinerary after I was upgraded, and it was not available for on-line change.
The gate agents at IND acted like they knew about it and checked me in no problem. The agent at AUS looked at me like I was a moron, made me scan my credit card again, and also printed out the itinerary and tried to scan it at the kiosk. At least when the person traveling with me (on different itin) he did not make her go through the kiosk.