I use a Arduino Duelmilanove to talk to a DS1307 RTC and to a Matrix Orbital LCD with i2c (wire library). The i2c addresses are different for the two devices.
The RTC works fine when it is the only device connected to the i2c bus. When the LCD and the RTC are connected to the i2c bus at the same time, the LCD works but the RTC send weird data.
Any help or clue is welcomed ! Thanks. Winz