Many sites including DotNetNuke are using FreeTextBox ASP.NET HTML Editor. I've noticed that on my Windows Server 2003 machine running IE I am not able to do Control-V to paste text to the editor, even if I can right-mouse click and select “Paste” . It was quite annoying.
Accidentally I found that IE permission "Allow Paste Operation via script" is disabled on this machine.
I've enabled it and now I can use Control-V to paste.
I am not sure which security risks are envolved with enabling this option.