been using this thing for a while now, never had problems. lately i have been recording music from my reciever to protools through my mbox. so i'm using rca cables with rca to mic adaptors going in to my mbox.

now for some unforseen reason, when i plug my reciever into my mbox the signal from the reciever gets killed? and strange things are happening, almost like the signal is being sent back to the reciever. sometimes my reciever switches from phono to tuner at the moment i plug it in. crazy feedback and strange humming is all you can get out of the headphones/monitor from the mbox. what is happening? anyone have an idea?

thanks in advance