I can think of another reason that RobertB can't login with his old id/password, that is, all his username/password info is embedded/saved in his office computer/laplop/cell-phone/etc. Once those gadgets were gone, it will be difficult for him to login successfully.
I was visiting my brother this August and was trying to show him some of my favorite forums, and I just can't log-in, I tried (believe me) with several possible passwords that I normally used, but just can't remember the correct one. Finally, I had to give up trying. Once I was back to my PC, everything is fine (I rely on a password program to save all my id/password)!
If my PC is gone, I might need to register using another username and password. Because of the experience mentioned above, I'm saving the id/password to my flash disk (including the password program, otherwise the data file is useless/can't be open with any other program).
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