[Paraview] Bug in ExtractBlock?

[Fred Fred]

Hello,I have a dataset that is actually a multi-block with just a single curvilinear block and I would like to convert it in a simple curvilinear dataset. I expected that ExtractBlock would make the job, since it is supposed to delete the umbrella structure when just a single block remains and the Prune Output option is selected, which is teh default BTW.But the output is exactly the same as the input.Bug of the ExtractBlock implementation?
Configuration: ParaView-3.10.1 64 bits Mac OsX Snow Leopard
 		 	   		  
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