XL2010
I've successfully done this with numerous other workbooks but not these two.

Runtime error 1004
wbThis.Worksheets("Sheet1").Range(Cells(LastRowORD, 1), Cells(LastRowORD, LastCol)).Value = wbCSV.Worksheets("Sheet1").Range(Cells(i, 1), Cells(i, LastCol)).Value
The Range is valid because
in the immediate pane with EACH RESPECTIVE WORKBOOK ACTIVE
I can successfully select each half in this manner:
wbThis.Worksheets("Sheet1").Range(Cells(LastRowORD, 1), Cells(LastRowORD, LastCol)).select
wbCSV.Worksheets("Sheet1").Range(Cells(i, 1), Cells(i, LastCol)).select