I'm using Richards code with a small 0.96" 128x32 OLED display, soft I2C (because the 18F46K42 doesn't have the "old" MSSP module).
I've managed to print text and variables on the screen but in order to update those values without clearing the whole screen I'm trying to figure out how to use the GLCD_CLR command to clear an area.

I can make it do something but what it does doesn't make much sense to me. It seems to be pixel by row based but still, it's acting weirdly on me.
For example, with the following screen as a starting point:
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GLCD_CLR 0,0,5,1 or GLCD_CLR 0,0,10,1 does absolutely nothing while GLCD_CLR 0,0,10,2 does this:

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GLCD_CLR 10,0,40,1 does this (which is reasonable, clearing a section of 30pixels wide, 1 row high):

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While GLCD_CLR 10,0,41,1 does this:

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I'm also getting strange results with the GLCD_BAR command. Anyone knows/understands what's going on here? Am I using it wrong or have I stumbled across an issue?

/Henrik.