Few days ago I realized that with some clients I couldn't click on any pages.
I could use the send (alt + esc) to open the start menu but couldn't click any of the windows.

Even stranger through, neither can the end user. It locks them out from clicking on the windows.
They either have to reboot or close open a new window after I disconnect.

I thought it might have been the version of the serverX, but it happened when using your demo page as well."
I also thought it might had been the viewer, so I used your viewerX as well and got the same result.

The various circumstances have been with XP and vista (UAC disabled). Has anyone else had reports of this?

Thanks