I encountered a problem with the "Corner Relief". I've tried it on several different gauge thicknesses and I can't seem to get it to work. I created a simple 2" square Base Flange with 1" flanges on all four corners. Every time I try to add a "Corner Relief" each corner, it gives me the "invalid/error" message. I've read the help file. I've tried selecting all corners and doing it manually. I can't figure out what I'm doing wrong.