I've had absolutely no problems with copy & paste post-JB (4.1.1) update.
You may want to visit the XDA-Developer's Forum ( http://forum.xda-developers.com/showthread.php?t=1984126&page=32
) where we have an ongoing thread regarding any & all problems with updates & post-updates.
As an FYI, I've found it much easier to carry on a dialogue with Samsung Support either on Twitter or Facebook.
PS: I copied & pasted this post using one of my text editors.