Check out the .bmp of window settings. The trim is being drawn from the outside edge of the window to the inside of the window, rather than the opposite way.
Just on the off chance, I tried a negative value for trim width, but it would not draw the window at all, just cut the hole in the wall.
Any fix for this around. I am using the updated SE9 library. Had no problems before today, although this is the first time I'm using this particular window style.