I am having a similar problem. I don't get an error but I can not do anything in connection with a WA extension.
The dialog window for the WA extension opens but all that it shows is the "LOADING...". Then, DW hangs and I can't do anything other than escape from that dialog window.
I'm on a Mac so it is going to be slightly different than someone on a Windows machine even though the cause is the same.
Something must be wrong with the server at WA that verifies activation codes however, I thought this was a problem that was eliminated a few months ago. So I don't know for sure.