[GRASS5] [bug #2765] (grass) v.buffer produces strange results

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this bug's URL: http://intevation.de/rt/webrt?serial_num=2765
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Subject: v.buffer produces strange results

Platform: GNU/Linux/i386
grass obtained from: Other (CDROM etc)
grass binary for platform: Downloaded precompiled Binaries

When trying to create a new buffer theme with v.buffer (polygon theme), I got strange results when using different buffer distances: small buffer distances worked quite good, but at a certain buffer distance, the shape of the new buffer theme was completely different compared to the input vector theme.
I used the following syntax to create the buffer theme:
v.buffer in=polygonmap out=polygonmap_buf buffer=buffer_distance



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