🚀 go-pugleaf

Don't you have added myLine in a picture for which you have also defined a
brush?
From the manual:

		A picture has its own state
          which is ``concatenated'' with the state of its sub-
          graphics when the picture is drawn or erased.  The
          semantics of concatentation are that subgraphics are
          drawn with the picture's state information substituted
          for their own, except for attributes that are undefined
          (nil) in the picture; the subgraphics' individual
          attributes are used for these values.

This may be your problem...
-- 
  Arnaud LE HORS     BULL Research France -- Koala Project
  lehors@sa.inria.fr  Phone:(33) 93 65 77 71  Fax:(33) 93 65 77 66
  Inria Sophia Antipolis B.P.109 06561 Valbonne Cedex France