Two things to consider first are the elevation bitmap is size 1024 x 1024, and the ground type bit map is size 4096 x 4096.
Don't know if you already considered that or not but just pointing it out.
A screen shot of what you are looking at helps in figuring out the problem to.
Will try to look into this this evening when I get home.
And no your not being a pain in the but*

midi