Do you have Skype installed? There have been reports that the Skype Toolbar that installs will mess up copy & pasting. It was seen over in the FrameMaker forums as the culprit.
Then that will cause a major problem as the company I work for uses Skype extensively as part of its operational necessities ☹
May or may not be the culprit in your case - easy test - just uninstall Skype temporarily and see if the issue goes away. If so, then try reinstalling it without the Toolbar add-on (supposedly that's what hijacks the clipboard). If not, then you got something else wrong and further troubleshooting is in order.
I believe I have discovered what is causing the copy/paste problem but not why.
I copied a table and pasted it in the same topic, with no other application running, everything works fine. I then pasted it again, same result.
I then opened IE 9 and tried pasting in that same RH topic, surprise surprise, text only. Closed IE 9 and tried again, problem gone.
I then installed Google Chrome and tried the same again, exactly the same thing happened. It would appear that having any internet browser open causes the problem. Not prepared to try all the other browsers but at least I have a work around although, a proper fix would be better though. Just glad it had nothing to do with Skype☺
I don't actually use Skype, but I'd expect the Skype Toolbar mentioned above would be installed as a plugin for the browser. So by running the browser you are running the toolbar. Hence why you have a problem when the browser is open.
I did a search and found this page with instructions for how to remove for IE8, which I would assume would be similar in IE9.
Tried disabling the plugin (in IE( it is actually via a drop-down option ‘Manage Add-ons’). It didn’t cure the problem. It also re-enables when you reboot anyway
However, Skype ‘Click to call’ is listed in Control Panel as an addition to Skype. Unistalled that and all is now good in the world (at least as far as cut/paste.