Can't login

Everytime I login it keeps saying "Please convert this account to a Blizzard one" and idk why it's not working. I used to login in completely fine before today

bump........

I'm having the same issue and I was just logged on the other day

I've Tried messing with the Config file and also removing the cache files and nothing seems to work . My game just says connecting for like a min each time I try to connect then various messages usually that I need to convert my account.

I'm still logging on ok, but I noticed that starting the Warmane MoP client now causes my retail Battle.net account to start updating. It never did that before. I think there's been some change in the retail setup that makes it "communicate" with your MoP client.

A bit worrisome- I wonder if there's some way Blizzard could attack your old clients.