At this point, my only guess would be that maybe the target URL isn't matching the page permalink for whatever reason. Maybe you need to double-check your permalinks settings and make sure they're saved correctly.
Also, are you sure you're putting the filter in the "Target by URL" box, and not the "Notes" box? If it's not in the correct place, it won't work.
If you continue having problems, you may want to try asking for support on the
Widget Context wordpress.org page. While it is my preferred method for making the demo content able to be page-specific (and I try to help with it as much as I can), it is still a third-party plugin, and is not technically covered by Shape 5 support.