In order to reproduce it, draw a rectangle with radial gradient fill, with direction
and normal, both of length 1.
This one works (no vm crash):
|form canvas fill direction normal|
direction := 1@0.
normal := 0@0.
form := Form extent:300@300 depth:32.
canvas := form getCanvas.
fill := GradientFillStyle new colorRamp:{0 -> Color white . 0.5 -> Color green . 1 -> Color blue};origin:150@150;direction:direction;normal:normal;radial:true;yourself.
canvas fillRectangle: (50@50 extent:200@200) fillStyle: fill.
Display getCanvas drawImage: form at: 300@300.
direction := 1@0.
normal := 0@0.
-> OK
direction := 0@0.
normal := 0@1.
direction := 1@0.
normal := 0@1.