If it happens again, I'll sort it. I have changed at least two maps so far, and will be changing a third tomorrow because I haven't had the time all week. The main CoD2 server menu is pretty crap so I don't always trust that - i've had servers vanish from there and then come back again like it was nothing. I have noticed that some maps take a while to load, or change - and that has been worrying me.
What I'll do before everyone gets in tomorrow is give the rotation one more blast through to check for any hiccups. I am pretty sure I got them all - but doesn't hurt to check. I will also see if I can remove the fog in the maps too; had some complaints about one of the maps being too foggy. It's on my to do list after I've finished doing some studying.