hi,
Im using 2 i2c pwm boards - one from adafruit (board 1), the other a knock off from ebay (board 2).
I was having trouble with my servos going crazy on board 2 so after some faffing about i ran an i2c scanner, with both boards plugged in the i get this
Scanning...
I2C device found at address 0x40 !
I2C device found at address 0x41 !
I2C device found at address 0x70 !
done
and with board 1 unplugged i get
Scanning...
I2C device found at address 0x41 !
I2C device found at address 0x70 !
done
Board 2 is registering 2 addresses
From the adafruit site i can see that it can only have the addresses 40-44 so i dont think ive got a short in another address.
Has anyone experienced this before or know of a solution? Or should i just fork out for a real adafruit board? 
Many thanks
Andrew