Hi Thibaud, thanks for reporting this bug.

So I think what's happening is that when MoI reads in a PDF file, it runs through the same code as importing an .AI file from illustrator and one of the things that happens is that the imported curves are processed so that curve segments that are pretty close to being tangent to one another (within 3 degrees) are tuned up to be exactly tangent.

But the case of your curve, this is not a good thing to do, because your curve is not actually made up of smooth curve pieces, the parts that look like arc corners are actually just a whole lot of little lines. I should make the importer not try to align the segment's tangents when the whole curve is only made up of line segments.

I can't seem to open your original DWG since I only have AutoCAD version 2008 over here - is your original drawing made up only of little line segments in it for those areas that look like curved corners, or is that something that happend during export to PDF ?

If you explode the longer curve into separate individual segments before exporting to PDF, that should avoid having the tangent alignment happen, does that seem to solve the problem?

- Michael