Hello,
See attached screenshot of not snapping;
If drawing was closed and opened then "snap to intersection" works on all corners of polygon.
OS: linux, KUbuntu 15.04, 3.19.0-30-generic, 64 bit;
Version: master
SCM Revision: 2.1.0
Compiler: GNU GCC 4.9.2
Qt Version: 4.8.6
Compiled on: Oct 10 2015
fixed in master branch, commit: https://github.com/LibreCAD/LibreCAD/commit/fe434c5e53a7644ba47607ea86802e3264fc6318
backported to 2.0