hum???? sorry I'm newbie with these stuff .. can you be more clear? What is Pt and BiDir? hah

:( Hello, I'm having a problem with glass renderizing on skindigo. Even with glass acceleration option enabled it still seems to be "drizzled". What am I doing wrong, any clues? The 1st image has rendered all night long, like 12hours... without glass acceleration. The 2nd image has rendered for abou...