PS not letting me edit some random commands before executing them, including Duplicate, Fill, Print Preview, Stroke...possibly others I haven't discovered. When I click the dropdown choice, an edit window used to let me tailor pixel widths, color, etc. (I know, [it's what] 'edit' means). Now, the little eyedropper icon replaces my cursor, all top menus are grey except 'View' and 'Window', I get that awful 'doont!' sound, and my only option is to just hit 'Enter' and it executes the command with whatever preferences I last set before this problem, usually of no present use to me. I have relaunched PS, restarted the computer with no other tasks and relaunched, and impotently shaken my fist at the screen to no avail. Please help me, and if you'd be so kind, just email me the answer 'proteus19m (at) yahoo (dot) com'. Thank you very much.
Try resetting your preferences. Start PS and hold down crtl alt shift keys (cmd option shirft on mac) immediately. If fast enough you will get a reset window.