Plot Are not being able to format!
 

I have many charts on one page in Excel...all of them look the same, and are
formatted the same.

All, of a sudden, ONE of these charst shows a plot area of totally black..and
the right click "format plot area" is NOT there; it is as if I cannot change
the black formatted chart back to its original are!

Why this occurred on onlky one chart, I do not understand.

Can anyone help me to get this chart back to appearring like all the others.
They are all "line"charts.

Thanks,

FLKulchar

PS: all the others are line charts as well!: