OK Scenario:
Host : a Windows 7 Enterprise with SP1, configured as a VM on a 2012R2 Virtualization host with RemoteFX d3d adapter component AND RDP8.0 installed and configured per this article:
http://support.microsoft.com/kb/2592687
Client : a Windows 7 Professional SP1 with an updated client (Shell Version 6.3.9600, Control Version 6.3.9600, Remote Desktop Protocol 8.1 Suppoerted)
problems:
1.the windows 7 host used to add log entries into the RemoteDesktop-TSCore log Admin section upon clients connecting, per this article:
http://technet.microsoft.com/en-us/library/ff817575
but it is not doing it anymore after upgrading the RDP to 8. no signs of Event ID 2 in the Microsoft-Windows-RemoteDesktopServices-RdpCoreTS/Admin
2.the client is unable to RDP into the host if the "speed" of the client (the "experience" tab) is set to anything but the "LAN 10MB". it used to work with "Automatically Detect" settings before, until I manually changed it per the above technet article to activate RemoteFX (read the square at the middle-bottom of the article).now, even if I switch it back to automatic speed detection or some other speed, it goes just up to the "Estimating speed and quality" connection phase and then suddenly quits. the only way to get to the remote desktop is to set it back to "LAN 10" manually.
the Remote host just has some "warnings" regarding the previous (non-LAN) attempts, saying that the client is not capable of RemoteFX so RDP Graphic module will be used; no "errors". but as I told you, the client simply quits after the speed estimation.