Why do I have to search endlessly for the ability to do two simple things: change my account's master password and my Slingbox's viewing password? Every time I THINK I'm doing it, it tells me that the "current" password is invalid, which is bunk. After all, how could I have signed in if I didn't input the correct password?
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It seems that you are having some issues in order to update the information about your passwords.
The following links will provide you with the steps to follow in order to fix these issues.