Hello,
English is not my first language but I will try my best to explain my problem. First and foremost, I really like AngelCad, the premise and the performance is way better than openscad, so thank you for making it.
I am using Ubuntu 20.04 LTS and the installer with the deb packages. My problem is that everything runs ok until I render my model. It appears completely red and transparent (without the possibility to distinguish front from rear, etc). I have attached a capture of how it appears in the editor using a simple model (I think it's a cube).
I tried the windows installation in Windows 10 and it works fine, renders without problem and works as expected. My PC is 5 years old btw. What do you recommend? compile from source? I hope there is a solution, I use Linux most of the time and rarely touch my Windows installation.