Here are the instructions they sent me a while back when I had the same problem. It worked partially, but I still have to do the Ctrl/V thing 90% of the time.

Internet Explorer 8 is a quite temperamental browser. You can try editing your security settings as explained below:

Open the Internet explorer
Click on Tools and Click on Internet Options
Go to the Security Tab, Click on Reset All Zones to Default Level

If that button is Greyed then follow these Options

On the same window

Select the Internet zone and click the Custom Level button. The Security Settings window opens.

Scroll down to the Scripting section of Settings.

Under Allow paste operations via script select Enable or Prompt.

Click OK to close the Security Settings window.

Click Yes when asked if you want to change security settings for this zone.

Click OK again to close the Internet Options window.

We will continue exploring the operation of Internet Explorer 8 with our site, as this bug has our developers scratching their heads.

Let us know if this fixes the problem with your IE8 clipboard and our website.

Regards,

AGORACOM