I have recently ripped in new jingles from CART 0 to CART 31.  This was done using Auto Track Pro.  Once the jingle was ripped I selected 'Edit the cart with Smooth Edit' and applied the background and text colour's using the pallet.

Once the jingle cart was played in Myriad Playout it turned back to the default colour.  Out of all the jingles ripped this has happened to 17 of the 31 carts.