Hi,
Don't know about causes but my quick fix when it happened to me was to
create a macro:

Sub ResetDefaults
Application.Screenupdating = True
End Sub

and to assign a custom button to this on the toolbar. Then when you get this
problem you can run the macro & the screen will update again.

NLO

"Sandy" wrote:

sometimes when running code I get a situation where either excel crashes and
a portion of the display area is turns gray (about 20%-30% of the viewing
area top to bottom of the screen but not he tool bars) or with a crash the
area turns gray. It is always on the left side of the screen. The only fix is
to close and reopen excel.

Is there a know cause / fix?

Thank you