Resolution:
The iProcess Objects Server log swentobjsv01.log may also show -11 and -176 errors while the standard iProcess Client (Windows) shows no errors when accessing the same work queue and work items.

The problem could be the case of the iProcess nodename as defined in the config.xml, so verify that the case matches that defined in the SQL database's "nodes" table or as referenced in the swentobjsv01.log, e.g.:

swentobjsv01.log reports:
04148|01B10|05/09/2007 11:26:35.290|00000001|LOG  |Staffware nodename (STAFFW_NOD1)

config.xml:
        &ltrecord displayNodeName="myFirstNode">
            &ltNodeId>
                &ltComputerName&gttibsoft</ComputerName>
                &ltIPAddress&gt127.0.0.1</IPAddress>
                &ltTCPPort&gt17752</TCPPort>
                &ltName&gtstaffw_nod1</Name>
                &ltDirector&gtfalse</Director>
            </NodeId>
        </record>

The &ltName> parameter in config.xml should be changed to :

                &ltName&gtSTAFFW_NOD1</Name>

Why does the iProcess Client (Browser) return Error : -1 (Exception Thrown)One of the items in the array returned an error) - Queue not found when trying to lock a work item in a work queue?