ALTER TABLE SWITCH statement failed
I hate to say this, but there's a bug in Books Online. The Books Online page on partition switching says:


  Source and target tables must have the same column structure and
  order. The tables must have the same columns with the same names and
  the same data type, length, collation, precision, scale, nullability,
  and PRIMARY KEY constraints (if any), and also have the same settings
  for ANSI_NULLS and QUOTED IDENTIFIER.


But as you've discovered ANSI_PADDING is also involved - both the incoming &amp; outgoing tables have to have the same setting. There is no way to fix this after the data is loaded.