When I upgrade my code from 0.4.2 to 0.5 I get the following mysterious error when connecting to a message queue:

Data.Binary.Get.runGet at position 0: demandInput: not enough bytes

I'm limited for time at the moment, so I haven't had time to narrow down this test case from within the application that this occurred in, but my best guess from studying the diff between 0.4.2 and 0.5 is that this exception probably originated in your internal readFrame function.