Version: Enterprise 10.2.1

A Windows user is reporting an error tied to a RichTextBox
control. The error is:
"Error accessing external object property text."

The line of code it errors out on is:
THIS.Object.Text = String(my_blob_variable)

I know that the problem is with the person's machine since
everyone else doesn't have any problems. At the same time,
I'm a novice to the wide wide world of OLE.

Is this error due to Windows? or is this OLE problem due to
corrupt pfc's? Any suggestion on how I get this guy going