[GRASS-user] bug or buffer for polygons impossible ?

[Yvan Paillé]

Hello,
I try to create a buffer around a polygon with the following commande:

v.buffer input=... output=.... distance=10

This creates the buffer visible in the following picture:
http://dl.lyon.cemagref.fr/get?k=yQnyOaVULt3QQmOSSVa
Why is the buffer not uniform? (Regarding the upper left corner, one 
corner misses).

http://dl.lyon.cemagref.fr/get?k=IF0oiMFkqyVC9L9SCeA
http://dl.lyon.cemagref.fr/get?k=zCtzYAQDCXMYdz6TUoE
http://dl.lyon.cemagref.fr/get?k=IWMhOGONCrDQevnMRck
Other errors...

Is this a bug in the v.buffer function, or do I try to use the buffer 
function on polygons, which is not possible?
I'm working on WinGRASS 6.4.
Many thanks for any help!

Yvan