I am having the same issue. Looks like the issue where we can copy but not paste.
When we copy, usually a pop-up gets displayed saying that text has been copied to clipboard. That doesn't come anymore. Somehow it seems to be working just within Dolphin browser. So I think that its not the paste that is not wrking, but the copy - nuthing is getting copied into the clipboard !!!
I am on JB btw... So no solution still huh... ???