I'm afraid the change of editor is due to an upgrade of your existing editor due to security reasons.
(This is because I was having copy and paste problems, I never had before)
It is working differently because pasting can sometimes spread viruses and other nasties.
Ctrl + V automatically sort out pasted text to remove such nasties but a right click works differently so a box pops up.
I suggest you use Ctrl + V from now on to paste and the box will not pop up.
I have however tested the right click method with both Chrome and IE and they are working fine for me.
Are you using IE and at what version?
