In Pharo 1.4, browse Morph
Find the method fullDrawOn:

and replace

on: Error do: [:err |
                self setProperty: #errorOnDraw toValue: true.
                self setProperty: #drawError toValue: err freeze.
                ^ self drawErrorOn: aCanvas
        ]

by:
 value

Now you will have a debugger instead of the red square of death

But do it at you own risk ^^
Ben

On Nov 4, 2012, at 6:04 PM, laurent laffont wrote:

> Hi,
> 
> sometimes I have a PluggableListMorph that displays a big red square (see 
> attached screenshot). How can I debug why this happens ?
> 
> <image.png>
> 
> Cheers,
> 
> Laurent


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