I don't know how this has happened, but the log window has disappeared.
Whenever I run UDK with the log window turned on, I see the log window flash momentarily but then it vanishes.
I can still minimize it and I can maximize it, but in its normal state it doesn't appear anywhere on either of my screens, kind of like it were told to appear somewhere beyond the bounds of my screens.
I used to keep it at the top of my second monitor. I haven't changed my screen settings or the location it appears at. It's just... gone...