DV Info Net - Adobe Encore music menu issue

Hi,

I have recently purchased CS4 and currently authoring/burning one of my first bluray DVD's.
I am keeping it simple at the moment with only still menus & a few videos.

Anyway, all has been going well. I have figured out the best export settings from Final Cut Pro and have had minimal troubles importing the files into encore and burning them successfully onto a bluray dvd.

But... there is an issue with the menu. I want to have music playing in the background of a still menu. Seems simple. It's an mp3 file, and in the preview/simulation for dvd, all works fine. It's when the bluray DVD is authored and playing on a bluray player that's where the issue is. The first second or two of the song is repeated over and over (the menu constantly resets itself).

I've checked/tried a few things...
- The audio file is fine and plays fine (had no troubles burning it on a sd dvd via dvd studio pro, but that's apples when encore is more bananas)
- Have converted the file from .mp3 to .wav and .ac3 (as I read those were recommended for encore) yet problem still persists.
- Previewed the dvd before it was burnt each time - and plays fine in the preview - it's just once its on the blu ray dvd, that's when the problem occurs.

Have tried it with another .mp3 and the problem still persists so I am imagining it's not the actual file but more of a transcoding/authoring issue.

A still menu - no music in background works fine. It's just when adding music there is an issue.

Can anyone help me? Been searching for known problems on this forum & on others but haven't found a solution so I thought, since I have been given great advice here in the past - surely someone out there can help!