I have not recently updated my settings, have confirmed that the colour profile is RGB and yet I cannot save for web. It has suddenly gone grey and unable to access. I cannot even Save As a jpg or png! :-/ I'm running Photoshop CC on a Mac 10.9.4
Under Image > Mode > RGB are you set at 8bits/channel?
Thank you, Nancy. Very sorry for the newbie question. That completely fixed it :-)
Very sorry for the newbie question. That completely fixed it :-)
Don't be sorry. We've all made that mistake at least a few times.
Glad I could help .