Sigh....
After reading both of your replies I logged back into WoW, and I was like "OH, you blind dummy".
Don't know how I missed yesterday that I was looking at the WoW Quest Watch Window, and NOT Carbs. My next immediate thought was, "Why am I not seeing Carbs Quest Watch Window?". Took a look in WoW's Interface/Addons directory and saw that only the core Carb files were there, and none of the modules, so all I had installed was the Carb map stuff. For some reason or other, when the Curse Client installed Carb from scratch it only installed the core modules, first time Curse has done something like that to me. Did a reinstall and that solved the problem.
<BLUSH> Too many hours at the keyboard I guess!
Anyway, thanks for the replies, and especially for that window reset command, that'll probably come in handy in the future.