In RFEM 6.12.0010, the arrows on members showing their orientation are not visible, even though it checkbox is checked, as seen in the video.
Hi there! 
Have you tried restarting RFEM? Does the issue also occur in other/new files?
- If not, could you please send me the file in question?
- If yes, I believe it might be related to a graphics issue. In that case, please try updating your graphics card driver to the latest version.
Let me know how it goes! 
Hi,
Thank you for your reply.
I found that the existence of a background layer dxf is causing the problem, as shown in the video.
more specifically, the length unit of the dxf file is affecting the visibility of the member orientation arrows:
background layer of dxf file with length unit in mm => no problem
background layer of dxf file with length unit in m => member orientation arrows disappear
deleting the background layer of dxf file with lengths in m => arrows come back
Thank you for your feedback and good that you found the reason. Could you please provide your files to double-check it. Thank you.