FILLMODE
and the other members of the FILL Family:
If solid fills, filled fonts, or wide polylines are displayed as only outlines of these objects and not filled, look at the settings of the following system variables:
TEXTFILL. If this system variable is set to 1, TrueTypeŽ fonts will be displayed as filled while plotting and rendering. If set to 0, TrueType fonts will be displayed as hollow.
FILLMODE. If this system variable is set to 1, hatches (including solid-fill), two-dimensional solids, and wide polylines will be displayed as filled in.
SHADEMODE. If this system variable is set to anything other then 2D wireframe, objects will be displayed as hollow.
FILL. This system variable controls the filling of objects such as hatches, two-dimensional solids, and wide polylines.