I have never had this problem in Rhino 4. In the file attached, there are three objects. The one on the right is what I have gotten in the past in Rhino 4. The other two are original and the result that Rhino 5 is giving me. Not sure what the problem or difference is. They are not the exact same, but the process I used is the same for both. Any ideas?
Fillet Edge-Forum.3dm(1.1 MB)