Hi Armin, the chamfer problem is due to the surface having a very tightly curved area in one corner of it.
Something didn't go quite right in that area, it looks like in your original curve there are a set of very closely clustered points in that area.
You can see it if you switch to the Left view, and then go to this area:
And zoom in quite a bit, you will then see this tiny tightly curved zone:
That is what is causing a poor offset - both chamfer and fillet involve doing a surface offset and surface/surface intersection as part of their calculations and tiny tight bends like that tend to mess up offsetting.
So I'm not quite sure what happened there, but it looks like the curve on that side got a strange little piece to it or maybe was not aligned to the other curves at that end during surface construction or trimming and did not produce a good result... That probably needs to be redrawn, let me know if you need help reconstructing it.
- Michael
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