Form Element error

I am baffled. I have a script that works fine on 1 PC but doesn't work on my other PC. According to my IS department, they PCs are identical in setup.

PC1:

AutoIt ver 3.3.8.1

IE 8

PC2:

AutoIt ver 3.3.8.1

IE 8

; ECM Master
If Not WinActive("[TITLE:ECM_Master; CLASS:IEFrame]","http://lynpim.mycompany.com/pim/form/ECM_Master.html") Then _
	 WinActivate("[TITLE:ECM_Master; CLASS:IEFrame]","http://lynpim.mycompany.com/pim/form/ECM_Master.html")
	WinSetState ("[TITLE:ECM_Master; CLASS:IEFrame]","http://lynpim.mycompany.com/pim/form/ECM_Master.html", @SW_MAXIMIZE)

$oIEMaster= _IECreate("http://lynpim.mycompany.com/pim/form/ECM_Master.html", 1)
$oForm = _IEFormGetCollection ($oIEMaster, 0)
$oQuery = _IEFormElementGetObjByName ($oForm, "htmlform")
$elements = _IEFormElementGetCollection($oForm)

For $element in $elements

If StringInStr($element.value, "Release a New Mat'l/Doc") > 0 Then
	$New_Button = $element
EndIf

Next

_IEAction($New_Button, "click")

As I said, when I run this on PC1, it works just fine and does what it is suppose to do; click the "Release a New Mat'l/Doc" button. However, when I run this on PC2, I receive this error:[/indent]

U:\AutoIt files\AU3 files\PIM ECMs\Test\!NewPartAnnotate.au3 (81) : ==> Variable must be of type "Object".:
For $element in $elements
For $element in $elements^ ERROR

Does anyone have any ideas of things I can try? I really need to be able to run this on multiple machines.

Thanks,

Kristine