Two of the fadeImage... methods in class DisplayScreen open the debugger 
(#fadeImageFine: as well #fadeImageCoarse:) on Win2000, Squeak3.2alpha.

|form|
form := (Form extent: Display extent depth: Display depth) fillWithColor:
Color blue.
Display fadeImageFine: form at: 0 at 0.

returns "Error: Improper store into indexable object"

Others seem to work:

|form|
form := (Form extent: Display extent depth: Display depth) fillWithColor:
Color blue.
Display fadeImageHor: form at: 0 at 0.
Display restore

Bye
Torsten