The context for extension type buttons is not relevant.
If your problem is that a queue button is not showing queue members, it is because it is missing the extension or queue directive in its configuration. If you already place that, look for a typo. check that you are not using some #exec line that override your manual configuration. There is no other reason for not having queue members displayed on a queue button, so I know for a fact that the problem is a missing extension/context directive in the QUEUE button.
You can try to catch me on the live help and give me access to your box, so we can verify together.
