All of the sudden I'm having the same problem as Teamgrizzly and kenphillips. I have been using keyclone/maximizer fine since the patch until today.

When i fired up keyclone, AVG threw a fit at WoW.exe, asking me if i wanted to quarentine it. I said no, and let it keep on working. And just like that, Maximizer hasn't been the same. The first instance i fire up will work, but any subsequent wow instances aren't picked up by maximizer, they open in regular old windowed mode. And they won't receive any key strokes either.

I've disabled AVG to rule that out as a problem, but it doesn't seem to matter. I have no idea what has changed since yesterday afternoon.