See title.
DMap intro doesn't reappear after death
I think you have to set that with the checkbox.
That isn't the problem: That checkbox you're talking about just makes it so that the Intro String always appears whenever you warp into a dungeon screen, making for unsightly things such as the string appearing after you go down to a lower floor.
This also happens in 210test, which was clearly made before the 'Always display Intro string' was implemented.
death->Continue, or death->Retry?
I wouldn't expect the message to reappear after death->Continue.
I thought this was only supposed to play once.
It is only supposed to play once. That's how it's always been I thought.
I'm going to mark this as not a bug for now, and the developers can come back to it if they feel otherwise.