Hi Mike

You generally get a performance gain from running word with .Visible =
False.

If you want to run with .Visible = False and not .Activate-d, then the code
itself should be written so that it will do exactly the same thing whether
or not Word is .Visible or .Activate-d.

I would suspect two likely problems with the code.

First, ensure that the code is always referring to the correct Document. For
example, don't rely on references to Word's ActiveDocument. Create a
reference to the Target Document, and use that reference consistently.

Second, don't use the .Selection. Instead, set a reference to a range, and
use that.

Hope this helps.

Shauna Kelly.  Microsoft MVP.
http://www.shaunakelly.com/word