Graphical Displays with PBP3

[rocket_troy]

Hi Richard,
I've been using your display drivers with 12864 ST7920 LCDs and one thing that's annoying (for me) is randomly on startup I'll be getting 3 large(ish) zeros in the top left corner of the display. If they appear, there's no getting rid of them without cutting power to the display. Any idea what I'm missing here? I can still write stuff to the display, but the zeros will remain there irrespective of screen clearing. Even filling the screen with a filled (black) rectangle - the zeros are still there but just colour inverted.
You can see if they're going to appear with the initialisation call to st7920_init as the areas around there is more populated with random dots than neighbouring areas. Sometimes it's clear enough to make them out before calling a screen clear and show.

Could this be a timing problem on my initialisation? It's happened on various displays (same model) and various completely different programs.

Troy