Checked and double-checked this little bugger, and it seems to do the right thing on other items, except for this beam. Doing view > cut profile, create a single line where the beam has te be cut off, click finish, and this message appears (see attachment). I've tried the pick lines and line tool, trim to corner, trim single element, but none of it seems to address this issue. Zoomed in a gadzillion times and am sure that the grip points lie on the boundary lines. 
What am I doing wrong?

What am I doing wrong?
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