I just ran into this same issue on a newly create RHEL 6 linux install in our lab environment. I was unable to use an broker commands that required connecting to the queue manager (e.g. mqsilist, mqs ...
Did you ever get a resolution to this issue? I'm getting the same error, using the .NET PCF classes. It appears that it is complaining about the MQIACF_OBJECT_TYPE parameter of MQOT_Q.