Actually, I think there is a simple explanation.

Your connection to the WL server is poor. Try this: when you see a black dot, wait several seconds till you give up. If the connection is there but not that bad, it should turn e.g. yellow in a few seconds. Then you can proceed.

Otherwise, it does happen that the WL server is "down" to you and you can only try again at a later time.

I have experienced what you did several times and it is nothing to do with clients or their versions.