i think its mainly blocking at test detail for most of us.
Use none in language test and test id with 000 and test date is your application date. I got these tips from our other members who tried and got it on friday. It worked for me too yesterday.
Another important thing is that like mf4361 said, you need to verify what you gave in the application for city of birth and country and enter exactly. I was doing mistake by not entering correctly.
What my issue was in city of birth: I gave my information in my paper application in the format of "city,state". I thought they would just enter the city alone - may be my mistake by giving the state name too. They entered in the system as "city state". i started verifying my recent gcms notes after i saw mf4361's note.