Hi Jim,
The simplest way to deal with multi-values is to use a formula. Please try using the formula
@Implode( FieldName; ",")
I've just tested this & it works. You can enter the formula in the "Export Fields" section that below the area where you select the fields. Let me know how this goes.
You will also need to use a formula like @Abstract if you are dealing with a Rich Text field.
Regards
David