I just started to use ADE, and had as many others problems w authorization, of the computer in this case (win 7/8 with Adobe ID).
I found the solution was to use a password consisting only of letters a to z and digits 0 to 9. The Adobe web site accepts other symbols in the password, but the ADE does not.
Perhaps this could be of help to somebody.
As a side note, I did also have problems signing in to the Adobe forum, have to use my mobile to write this. Adobe, you should really improve your authorization software, its current state is not acceptable.