odd, mine acts competely different.
If i pause music then go to video, when i leave the video RR will stop the audio in winamp and i have to manually restart the audio from the begining of the song. I would say this is a bug, im sure its not supposed to stop the audio, but prob resume it.
If i shutdown RR with audio on pause, when i start RR again, it will resume the audio, but i also have a winamp pluging that resumes the music for me at the exact point in time it left off at. So i have RR set to never resume.