> 1) saga
> two options used (with inner boundaries and without): the boundaries still
> exist


this doesn't work, but the issue seems this one

http://hub.qgis.org/issues/5946

that you filed. In native SAGS it works.



> 
> 2) ftools: the resulting polygon is empty
> Dissolve instance has no attribute 'myParam'
> Traceback (most recent call last):


ftools works for me (with your input layer) both in sextante and
directly from the vector menu.



> 3) grass: it seems that it does the work but an error occurs at the end
> the configuration region is set as default, "use min covering region"
> activated


GRASS dissolve works for me, in both Sextante and the QGIS/GRASS plugin.


cheers

-- Giovanni --

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