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There are a couple of teams running ROS in the Cloud (even in EC2 land).

I have not seen that error, but one suggestion would be to run rviz locally and just set the ROS_MASTER_URI to the machine in the cloud (assuming that you're on a vpn or have the appropriate network config).

If you really don't want to run a local rviz, I guess another option could be to use Xnest.. it will be slow, but it's one means of getting to the true issue that you're facing.

On a possibly related tip, I'd also recommend that you try using Xvfb or something similar, and create a display that you use to render the remote simulation environment. I've never used x2go, but I'm wary of rendering the desktop over the (inter)network.