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I've replaced the standard ST7565 LCD for one with an RGB backlight, supplied by Adafruit.

Problem is, it's shifting everything down and right, and the left few pixels show some rubbish:

The same happens with the tester application (same pattern too!):

However, using Adafruit's library it all works fine:

Before I start ripping the st7565 files to pieces, does anyone have any suggestions what might be causing this? Looks like maybe a buffer somewhere is corrupt or it's sending the wrong data to the screen. Odd that by and large it works OK though.