I have a pie chart that gets updated every week with the same category names
but different values and percentages. I never had any problems until last
week one of them disappeared and I can't find it at all. When I point to the
appropriate wedge I can the popup that shows me what the numbers are, but the
label that I would have on that wedge doesn't show up. I have looked under
other wedges, played with the fonts and colors but to no avail. I am totally
perplexed.

Any ideas?