Why have my buttons for maximize, minimize and close turned gray?

Howdy, Troutbum63.

The change is due to a change in the 'Appearance' setting ('Blue' has likely been changed to 'Graphite') in the General pane of your System Preferences.

This article provides detailed steps and information for getting there.

Mac Basics: Modify your windows

http://support.apple.com/kb/HT2487

1. From the Apple () menu, choose System Preferences.
2. Choose View > General.

To change the colors of the window elements from the default blue appearance, you can choose Graphite from the Appearance pop-up menu to make OS X take on a cool, monochromatic graphite color.

Cheers!

Allen

All of a sudden, when I have some items/pages/websites open on my mac, some of the minimize buttons have changed from yellow to grey and cannot be used. This doesn't happen on all open items. Any ideas?