Userform ComboBox.List Location and Active Sheet Issues

Attempting to populate Combobox within Userform Initialize event. The cbo is populated from an advanced filter / unique list on a hidden worksheet. The cbo properly populates when that worksheet is the active sheet, but not from the worksheet where the userform (and initialize event) is fired. I thought encapsulating within a With/End With construct would prove the best approach, but to no avail. Thanks.

With wsData
        '~~> Ensure Dest range is clear prior to firing
        .Range("J1601:J1699").ClearContents
        '~~> Find String, offset 1 x 2, resize range to contiguous end
        Set rngFind = .Range("E:E").Find(strFind, , xlValues, xlWhole).Offset(1, 2)
        Set rngSource = .Range(rngFind, rngFind.End(xlDown))
        '~~> Apply Advanced Filter to send unique names only to range for
        '~~> consumption
        rngSource.AdvancedFilter Action:=xlFilterCopy, CopyToRange:=Range("J1601"), _
                              Unique:=True
        '~~> Populate combo box with unique list
        Set rngUnique = .Range("J1602", .Range("J1602").End(xlDown))
        Me.cboSubName.List = rngUnique.Value
    End With

And there you have it.

<facepalm>

Thanks.