I rebuilt my main desktop a few days ago and ever since I’ve not been able to connect to it with Remote Desktop. I click connect from the other machine and the buttons grey out for a moment before they reset. No error message is displayed. Checking the event log shows a number of Application Popup errors relating to RDPDD.DLL.
It turns out that this is caused by the latest NVidia drivers – which of course I downloaded and installed on rebuilding the machine, the only fix at the moment is to add this to the registry:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management] "SessionImageSize"=dword:00000020
Hopefully NVidia will fix this in a future driver.