It worked for me from day one because I was on Flash client. Once I switched to HTML5, Ctrl-X/C/V in chat stopped working for me (in Chrome). I remember it well as I used it often before that, and I couldn't do it no matter what I tried (outside of switching back to Flash).It worked for me from day one.
I always use those shortcuts!
I hold my left little finger down on the ctrl button, and use my index finger for C copy, X cut, V paste, Z go back one, S Save, A mark all, D bookmark, F find, etc. All with one hand!
I do this hundreds of times every day; it is second nature for me.
Now it seems to be working.