[all variants] password requested when mounting usb disks when 2 users logged in

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http://ubuntuforums.org – hi all. This is a problem i'm running into, i guess it's related to the new policy in ubuntu about mounting external usb's in /media/user instead of directly in /media. I am using lubuntu 12.10 64 bits. The thing is, bassically, i've got one user, called normal-user. She belongs to plugdev group. When she is logged in by herself, she can plug and unplug her usb devices with no problem. Now, we have another user, admin-user, with all admin privileges. The problem is, when both of them are logged in, if normal-user tries to plug in a usb device, a password window shows up in admin-user user de (Hardware)