The old bug

[andrewevstyukhin]

"Else" case contradicts the comment.

			/*
			// expand from 3 to 5 bits if this is from colour A, or 4 to 5 bits if from
			// colour B
			*/
			if(i==0)
			{
				ABColours[0][2] |= ABColours[0][2] >> 3;
			}
			else
			{
				ABColours[0][2] |= ABColours[0][2] >> 4;
			}

=> ABColours[1][2] |= ABColours[1][2] >> 4;