thank you very much for your post. I ran exactly into this issue. The System is a Windows Server 2008 R2 with Xenapp 6.0 and after i installed AVG, Clipboard & Smartcard Redirection was not working anymore. I did than the recover of this Registry key and after a reboot everything was fine again. But this does not happen more than 2 years after you Post. Whats going on with AVG and this Key?