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same problem here!
are you sure the I2C module is set on address 0x27, mine is on 0x3F (which is not changeable to 0x27) because the chip is newer (PCF8574A). If you have the old one PCF8574 you can change it to 0x27.
http://3.bp.blogspot.com/-eo_Aznh0Z-Q/ULG5VH6fG2I/AAAAAAAAAZY/uaJG0fL4e7A/s1600/PCF8574+address+map.png