... does any eyedropper work in other apps? in Preview (next to the Tint control in the Adjust Color dialog)? in ColorSync Utility (at the bottom of the "Calculator" tab)? from the Fonts dialog in any app?
YES, tested in Preview and through Fonts dialog
... have you rebooted since the problem occurred?
YES, more than a couple of times
... have you tried booting into Safe Mode?
YES, but not sure what that will accomplish, mac acted strange with screen jitter and when i opened aperture the photo would not appear (just the preview in strip view) and could not select the eyedropper anywhere. ( same issue)
... are you sure there are no system updates available (" ▹ App Store ▹ Updates")?
Absolutely, I check this very regularly.
... did you install any software recently or do anything that might have triggered the change?
I just installed a raw developer software ( Irridient ) and a watermark software (iWatermark).
Not sure how that would have affected. When I get some time I may try to uninstall and check. Wondering if I have to delete Aperture and reinstall. Any suggestions? Or things to do before trying that?