AAAAAAAHHHHHHHHHHHHHHH!

Extremely put out...every time I add a label to one of the label lists on the side, I'm careful to save the list itself, and then save all the changes in design. But when I go to check it out on my blog, it's gone. Returning to design, my list of labels was obliterated -- all labels deleted that I had selected. This is awful. It then won't show up, and no amount of going through and relabeling will make them show up again. Anyone know what's going on? Help, please!