Hi stevans,
Thanks for helping to bring this to our attention. We have recently become aware of an apparent compatibility issue between the new Internet Explorer 11.0 and the our current description editor that is available on our site which can prevent sellers from pasting text into the Standard version of the editor, so I suspect Internet Explorer 11.0 was installed during these updates.
Our technical team is looking into what we may be able to do to address that issue, but I am not sure when the issue may be resolved at this point so you may want to use an alternate browser for the time being so you can continue to paste into the description editor.
Aside from reverting back to Internet Explorer 10.0, you could potentially work around this issue by using the Mozilla Firefox or Google Chrome browsers, which can be downloaded at no cost from the following pages respectively:
Firefox: http://www.mozilla.org/en-US/firefox/new/
Chrome: http://www.google.com/chrome
I hope this helps!
-Mike