If you open RC and go to any message/SMS thread and then use the Home button to leave the RC app, you will not get a notification in the Notification Area at the top of the screen. I get a new message alert sound but no "envelope" icon.
The only way to start receiving the "envelope" notification is to go back to RC and exit to a higher level or switch to another feature area.
This is not how Android SMS apps behave. The notification is only suppressed if the SMS window is "on top". If I am in the Android SMS app, in a conversation, and then hit the Home button - when a new SMS message comes in, a pop up notification as well as a notification area icon appear.
I miss RC messages all the time, because if I don't have my phone on my person when the message arrives (or have it in SILENT mode) there is no visual indication that I have a new RC message/SMS. The only way to know you have a new message, as it is currently implemented, is to open the RC app and look for the blue "new message" highlights in the list.
Does not conform to UI best practices of Android...