Posted by Rallaz on Apr 05, 2013; 8:06am
URL: https://forum.librecad.org/3D-Faces-tp5707847p5707854.html

Test made in win XP latest code:

File->open, select l.dxf
result: file are correct opened and 3dface converted to polylines

File->close, then reopened from recent files list
result: file are opened, layer are present but 3dface are not imported

Conclusion:
This seems a very strange bug, I need more time to investigate.

About opening with AutoCAD:
Layer definition is incomplete, do not have code 70 (flags) and 62 (linetype)
And layer name contains invalid chars "/" & "."