Have you tried relaunching Finder or restarting your computer?
all of sudden, all finder windows on my iMac show the details in grey.
I have attached a screen shot.
Any notions as to why and how to remedy this?
This makes yet another reason not to upgrade to Mavericks for me.There is nothing wrong with your Mac. That grey is how Finder columns are shown by default in Mavericks. I am not aware of a way to change it.