It appears to me that the problem is a simple anti-aliasing issue. The white lines are the result of your 2D program anti-aliasing the edges against the white background to smooth out the curves. The lines aren't actually white, but rather a 1-5% black, which appears as white. Try building your map in Illustrator, or turning anti-aliasing off in Photoshop. Incidentally, the 1% black is a good trick I've used before to have seemingly white portions be visible when the "white is transparent" otion is selected. ty