I2C LCD

[Demon]

As an outside chance change your pullup resistors to 4.7K, I have never used 1k. ...

Yup, from the manual:

The I2C clock and data lines should be pulled up to Vcc with a 4.7K

Could this be an issue?

Transfer on the I2C bus can be paused by the receiving device by its holding the clock line low (not supported on 12-bit core PIC MCUs). To enable this the following DEFINE should be added to the program:

DEFINE I2C_HOLD 1

Robert


EDIT: I would try one last thing with Dave's code, add PAUSE 250 before every write to the LCD, just to eliminate that possibility.