I've used this line of code for over a year with no problems. Today it's
giving an error.

If Not ScreenUpDate = True Then Application.ScreenUpdating = False

ScreenUpdate is BOOLEAN.

I'm getting Run-time error '50290'
Method 'ScreenUpdating' of object '_Application' failed.

What the ....

FWIW, I'm still using Office 2003.
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HTH,
Barb Reinhardt