Pie chart data labels and lines disappear
 

Help!

I have a couple of pie charts in a file that I've set data labels and values
to show. Everytime I close the file, when I reopen it, they're gone,
although when I go to chart option, both are checked as being displayed. If
I uncheck the boxes, then recheck them, the labels and values show again.
Everytime I close the file, the same things happen.

What's up with this?