When I do that, I end up passing:

<offerIDs soapenc:arrayType="xsd:int[1]" xsi:type="types:ArrayOfInt"><
+item xsi:type="xsd:int">5544</item></offerIDs>
[download]

and the fault is:

<faultstring>org.xml.sax.SAXException: No deserializer for int</faults
+tring>
[download]

I tried almost every permutation I could think of. I've posted the entire wsdl file here if you think it'll help (minus the actual username/password).

Thanks for all your help so far. :-)