As a user, Mountain Lion will not accept admin username

I was trying to install FireFox after download. When moving the firefox icon to the Applications folder a dialogue came up asking for an admin name & password.
It would NOT ACCEPT the admin name & password although I use the same name & password to get into the admin account - and THAT WORKS!!!?????!!!!
What's going on?
Mike.

I've been able to find my own answer to this one..........
First of all - when I log on to the administrator account I use the short admin name "Mike" and the correct password, and all is OK, I get into the admin account.
BUT: When logged into my user account and a pop-up window asks for an admin name and password (like when I'm trying to install new s/w) the short name is not accepted!
If I enter the long admin username and the correct password, IT ALL WORKS OK!!
This is different behaviour from pevious versions of OSX. WHAT IS GOING ON?????
Mike.

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[repost from: https://discussions.apple.com/message/19062891?ac_cid=op123456#19062891?ac_cid=o p123456]

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As a user, Mountain Lion will not accept admin username

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