BrisKites said..
If you are foiling on a 12m Single strut there is a good chance the wind is extremely low. This will happen with any larger kite in negligible wind.Try a short carve against the kite as you initiate the turn, this should create the line tension required.
As what Briskites says, but I would also add that downlooping is the way to go in really light winds. Keeps line tension as you carve around following the kite.