I have also never had any issues with editing base camps in WA worlds. However, to place a custom base camp in a world takes more of an effort. You can't save a base camp you've made as a base camp. You have to place it in the world, then change the lot type to base camp. Then you have to use move objects on to move the adventure board to wherever you want it, as it tends to get placed wherever you'd least want it. But also, keep in mind there are two different types of base camp - the WA type, and the ITF type. If your lot is designated as a base camp but there is no adventure board, and especially if you see a regular mailbox on the lot, you definitely have the wrong base camp type. Change it to the other one in Edit Town, then look for the adventure board again.
