Yes, I just tried again. Uninstalling and then reinstalling the Web Adaptor.
The Web Adaptor is 10.1 SP1. I think the ArcGIS Server is also. The software authorization page shows the software version as 10.1.1.
Can you navigate to this endpoint:
http://<arcgisserver>:6080/arcgis/rest/info
Can you tell me what it says in current version and full version please? Thanks-
Justin