I believe there was a discussion on the the forum here somewhere about the bad UV mapping of Poser's primitive cylinder. This could be causing the appearance of your thin little line.

"A lonely climber walks a tightrope to where dreams are born and never die!" - Billy Thorpe, song: Edge of Madness, album: East of Eden's Gate

Weapons of choice:

Poser Pro 2012, SR2, Paintshop Pro 8