The MQGET was succeeding but the message was unreadable. I was able to discover that the files I was using as a basis for my test were not using the same MQPUT as MQGET. The MQPUT was using MQPUTX a ...
I'm Putting the message within the same VB client application as I'm getting the message. Using QPasa!, I was able to verify that the message is successfully on the queue and has no headers.