[fit2rule]

I'm on Yosemite with the latest XCode, and all I do is right click on the title bar, as you say, and it gives me the full path to the file ..

[72deluxe]

Where though? The jumpbar does the same thing (sometimes - it is buggy). But where on the titlebar do I click to get the "file proxy icon" shortcut?

[fit2rule]

On the window title/filename? Works for me ..

[72deluxe]

Do you have a screenshot? Because mine looks very similar to the URL below, where as you see there is no part of the titlebar that has the filename on it....

http://i.imgur.com/BrbI3Tt.png