Yargh.

...Aaand there went George's display again, silvery-grey this time; the data-set is building up a correlation with sudden mouse-movements towards the edges of the screen, which is interesting because the wireless mouse is a bit on the elderly side and was losing its connection again all session, so it might be confusing the screen's attempt to refresh or something. Thinking now that replacing the mouse would be a good interim step to test since it needs doing anyway -- if only I had That Kind Of Money...