separate RGBA normal

[hdd]

hi to all ,
When I try to separate the RGBA value from the N channel output , Blender crash or have a strange output.
here an example file :
http://www.lorenzoangeli.net/down/crashtest.blend

just input the output of the separate , into the viewer....

it's a known problem ?
thanks.
L.

p.S
last CVS version