Type Mismatch When Working With Arrays

I have an ActiveX DLL that's being accessed by ASP.

I call one function which, in the DLL, returns a string array.

Public Function ProcessCookie(url As String, cookies As String) As String()
...
End Function

<%@ Language=VBScript %>
<%Option Explicit%>
<%

dim myObj
dim cookies
dim retCookies
dim i

set myObj = Server.CreateObject("MyObj.Processor")

cookies = "a=1001;"

retCookies = myObj.ProcessCookie("http://localhost/test.asp", cstr(cookies))

set myObj = nothing

Response.Write cstr(retCookies(0))

'for i = 0 to ubound(retCookies)
'Response.Write cstr(retCookies(i)) + "<BR>"
'next

%>

The 'retCookies' returns with 2 elements in the array (doing a ubound on it returns 1, so 0 and 1 are there), however, when I try to display the content, it gives me a type mismatch even though a cstr is around it.

Also, "IsArray(retCookies)" returns true, so the array is definitely coming back from the function properly.

If I copy the ASP code into a VB form (ONLY changing Server.CreateObject to just CreateObject and Response.Write to Debug.Print), everything runs just fine.