I was trying to organise my categories today (because I figured it's time I've started tagging instead), but when I tried putting some categories under parents, they disappear from the Manage Categories list. In fact, I don't see them in the checkbox list when I try to post a new entry either. However, the categories are still listed on my blog itself, which is somewhat confusing.
My blog: http://cactusbeetroot.wordpress.com/
(Update: I've just noticed that they might have become tags?)
Help greatly appreciated. =)