NServiceBus 2.0.0.1219 not picking up messages

After upgrading from NServiceBus 2.0.0.1145 (.net 3.5) to version 2.0.0.1219 (.net 4.0), messages are no longer pick开发者_开发技巧ed up from the queues when running on a windows 2008 server. Everything works as expected on my dev machine (win 7). Messages are successfully put on the queues, but then nothing happens.

Could this be a permissions issue? If so, I would expect an exception, or at the very least a log entry, but there's no indication that something is wrong.

loadFromRemoteSources enabled=true

and

<startup>

<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>

</startup>

has been added to the config, and I've also tried

useLegacyV2RuntimeActivationPolicy="true"

but no luck.

So nothing shows up in your logs or anything, the messages just sit on the queue?

It appears that it had something to do with the server not being R2. After upgrading to R2, everything works as expected