I have tried a few things and from what I understand you have to login with the exact same key you want to reveal. For example, I tried to reveal my private posting key by entering my private active key and it didn't work. I tried again with the posting key and it worked. It's the same with the active key, I can only reveal it with itself, which is a problem if you forgot/lost it... I haven't tried the master password...
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Thanks for your information cheers mike