I've had this happen to me before on Windows with i think Pharo 3 - so I've not seen it for a long time. I feel it's dependent on the graphics chipset.
Cheers -ben

Hi,

I've had a play with Pharo 4.0 on a OSX and it looks great. There is one thing I've noticed, whenever I open a new window such as System Browser or Playground in the environment and then move it or close it, it's leaving an outline of each position of the window, if I move a window it's leaving a trail of outlines. Any ideas ?

Thanks ����