Fillet rotates one line ?!?

Fillet normally works fine. But in this file something is wrong... 2 lines are joined with fillet. They are supposed to stay intact, they should just be extended to join. But in following example one of the lines is rotated?!?

Why in how to corret this?

I have Autocad 2008.

Are we missing something (the example) or is it my computer again?

First thing is are you sure-sure that the line rotates? Have you measured the angle/diviation?

Chavlji - did you solve this problem? If not, here's some info which may help you.

I remember reading this thread when you first posted the question, but at the time nothing like this had happened to me, and I had no thoughts on the matter.

Today, however, is a different story. There I was merrily joining lines with a 0 fillet radius, when one line suddenly rotated!

Turns out one of the lines was a polyline from a PEDIT I had done earlier. The non polyline was the one that rotated to join the polyline.

When I exploded the polyline, the fillet with 0 radius worked as would be expected.

Result when horizontal line was a polyline: