https://forums.autodesk.com/t5/autocad-forum/trimming-intersecting-lines-locks-program/m-p/5516897#M339384 <P>Welcome to the Autodesk forums</P> <P>&nbsp;</P> <P>If the "paths" are polylines and EDGEMODE = 1, there could be an excess of possible Trim possibilities.&nbsp;&nbsp; It would be easier to troubleshoot if you could attach a sample drawing containing just the 4 path lines highlighted in your screenshot, otherwise I'd try the following:</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>1) Select the specific objects to use as cutting edges during TRIM/EXTEND rather than pressing &lt;enter&gt; twice (which selects "everything" as a potential cutting edge).</P> <P>2) Verify that EDGEMODE = 0</P> <P>3) Try with COMMANDPREVIEW = 0</P> <P>&nbsp;</P> Mon, 23 Feb 2015 15:23:47 GMT nestly2 2015-02-23T15:23:47Z