Posible big on windows

[cartuchoGL]

Hello to all people behind shoes, good job!

I think i discover a bug on windows.
This code fails on windows xp and windows 2000, but run fine on a macosx 
machine

Shoes.app :width => 640, :height => 640 do
 background 'eee'
 @stack = stack :width => 62, :height => 600, :scroll => true do
   background 'eee'
   @stack_a = stack(:width => 62, :height => 30000) do
     background 'eee'
     para 'thing'
   end
 end
 para link('fail') {
   @stack_a.clear
   @stack_a.height = 530000
 }
end

After click on fail link, when scroll area a black box appear only on 
windows. If remove the background calls the error is present even if not 
click on fail.

Is this a bug? or I have an error on my code?

Thanks in advance for your comments,
Carlos.