Posted by dellus on
URL: https://forum.librecad.org/Trim-extend-and-parallel-lines-not-working-any-more-tp5720444p5720447.html

You may try and go to Options - Application Preferences - Defaults - Clear Settings - Layout or even All.
Reinstall doesn't remove settings in the registry. You could delete these manually if you have the knowledge or use a portable version from portableapps.com, which doesn't use the registry.

Else no idea what could be the reason.