Chart does not Auto-update anymore .Why?

I have a file that once I entered a value in an input cell the v-look up
grabs the data related to the input an displays that information. The chart
previously updated to reflect the new data once I hit return but does not
update without first saving the file. Is this a memory issue or something
jacked up in file/graph properties ?

Maybe check out Tools -> Options -> Calculations?
I'd guess it's something with the auto-update area of excel.

Tools | Options | Calculation

Is is set to Automatic?


HTH