I just tried & it was ok so I think it must have been a combo of edits.
There is some weirdness - one thing is consistently happening though if I rename a sub-forum in one category forum, a sub-forum under a different category forum loses it parent & doesn't display. Same one everytime too. I also get the index column headings ie Topics, Replies, Last Post appear at the bottom of the index grid as well as the top. If I fix the parent issue via the AP the bottom set disappears.
I'll get some screen shots later.