SqueakMap Package Loader initial translucency

> Hello,
>
> Can anyone explain why when one opens new Package Loader window it  
> looks like this:
>
> http://altair.dcs.elf.stuba.sk/~kosik/tmp39/ 
> SqueakMapPackageLoaderUgly.png
>
> If I move (halos / color halo) the translucency handle a little bit  
> (to whatever value), the appearance changes to more normal one:
>
> http://altair.dcs.elf.stuba.sk/~kosik/tmp39/SqueakMapPackageLoader.png
>
> I do not understand this. Is this a desired behavior? It does not  
> make sense to me.
>
> Regards
> --
> Matej Kosik
>