Hi Conrad
Sorry for the slow reply, been a bit busy lately.
I did some more diagnostics and it looks like the issue was being caused by a plugin in IE.
To answer your questions.
1. RU was already in Full Control mode and switching out and then back into Full control didn't fix the issue.
2. The Host machine is WIn7 x64. Tried remoting in from a Win 7 x64 and a Win 8.1 x64 machine with the same issue occuring.
We have a cctv camera system with a DVR that allows logging into the DVR via a web interface. The web interface uses a plugin that only seems to work with IE.
If IE was open on the host machine with the DVR web interface open then the Full control would cease to work. Close the interface web page and full control would return. Tried this on two host machines with the same effect. Open the DVR interface and full control would again cease.
Strange, but we have the work around now.
Thanks