To recreate, go to Zimbra in IE.
Highlight a message and select some of the text.
Press CTRL+C
On my installation, the text is unselected and does not paste
Select text again.
Right click.
On my installation, "Copy" does not even appear on the context menu.

If you change the format to plain text, it allows you to copy.

I have confirmed this on 4 different computers in IE7 and IE8.

It works properly in Firefox, Chrome, and Safari.

This worked in 5.0.16, but now does not in 6.0.5

I found this bug, but it is from 2008 and is not specifically the same.

Is this happening for anyone else? Has anyone found a solution?