A client rang me to tell me that the changes he’d asked for on his site were not appearing on his screen.

Me: It seems everything is there. Try refreshing?

Client: No, I still can’t see it.

Me: Are you sure? Try pressing Ctrl+F5 instead, there may be a cached version in your browser.

Client: No, I still can’t see it.

Me: What browser are you using to view the site?

Client: I’m looking at a screen grab.