Im not sure if this is your problem but when making a map in Dragon you need to make the water around the land mass (about 8 tiles out) shallow water and from that point out deep water. When you make all the water deep water then about 5 to 10 tiles out from the land mass will be a stripped like brown tile set.
you are wrong.
only landscaper and the new tool from xen use shallow water! dragon works with ONE color for all water.