[ubuntu] password boxes are grayed out

I actually posted this on the "Installation and Upgrades" forum, but I got no help, so perhaps a good soul on this forum can give me a clue. I have a vintage HP laptop (32b) that was running 14.04.5 OK. I upgraded to 16.04.1 and the installation finished OK, however all GUIs on the system show the password box grayed out when I have to elevate to administrator priviledges. However if I open a terminal I have no problem sudo'ing, e.g. sudo xxxx.... This happens on GUIs like software update, gparted, etc.

[edit] I just noticed something: there are two users on the system, both with administrator priviledges. If in the username I changed in these GUIs the username, its password box is not grayed out and if I revert back to my username then the box is not longer grayed out. What's going on?

Thanks in advance.

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[ubuntu] password boxes are grayed out