Added field to pivot table: Values Section field list now Big Red X --can't see fields

[pete234]

I don't find much by searching on Red X but my Value Field in Pivot Field selectors
has changed to a Big Red X on white background. I can click through it and the fields become visible for a second.
It is like a graphical corruption but with only 22 columns of data seems odd.
The fields are working but it just takes a long time to move things if I need to.
Any idea? And is it possible to make Values area actually expand when you move it instead of it resizing?

 

[mdrew9]

Is the measure implicit or explicit??

 

[pete234]

Well it seems a reboot of the pc fixed it.
I had another chart intensive workbook open that sometimes gives me that "not enough resources to display".
Everything seems fine now.