I have already upgraded the viewer. I suspect that the problem may be on the host side. The machine I am having trouble with is running Windows 8. I can connect when someone is using the machine, but not when it is idle. Is there an issue with those machines and sleeping?
I am also facing the same problem. For some reason I don't understand, although the host is on (always 24/7), when I try to connect - just sometimes - it says that the host is idle. And then, I go there and try to connect using my laptop as viewer next to the host and I see the red circle on RU icon. Than I have to click it directly on the host's desktop to turn blue again so I can connect. My problem is that now I am travelling next week to overseas about 7000 miles from here and how will I connect if it goes red and I won't be able to turn it blue again?