Yeh, actually it needs calling - I was a bit quick of the mark - I just spotted the MAV went away - but when I tested DrawMapTile() in fact the program was never getting there - so sorry about that.
I'm still nosing at it.
EDIT:
By the time the program gets to DrawMapTile() the value of DrawMapImage appears to be 0 - it should not - that image will not exist.
I'm still nosing at it.
EDIT:
By the time the program gets to DrawMapTile() the value of DrawMapImage appears to be 0 - it should not - that image will not exist.