No, I was in full screen, got the error, took the screen shot, Shift+F4, pasted screen into paint and saved it, Shift+F4'd LFS window, took 2nd screen shot and pasted that into paint.
Reconnecting back to the same server a 2nd time didn't give the me error again. That's why it maybe a red herring because it's the first time I've had the error and the only change to LFS was the T3 patch. Also, no one else has reported this error (it could have been a comms problem with my internet connection).