OpenSCAD multiple OpenGL errors, crashes on render

[Robert Marshall]

After upgrade from 20.10 to 21.04, I am unable to run OpenSCAD successfully.

The program launches ok, but after clicking New or loading a file, the preview/render window is blank with no axes shown. When opening an existing .scad file, the Console window shows that the design was rendered, but nothing appears in the viewer. If I then try to do a full Render, the program crashes.

If I run OpenSCAD from a command line, I see numerous OpenGL errors:

===== START =======

$ openscad
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
GLEW Error: Unknown error
OpenGL Error: invalid operation
OpenGL Error: invalid operation
OpenGL Error: invalid operation
OpenGL Error: invalid operation
OpenGL Program Linker Error:
error: linking with uncompiled/unspecialized shadererror: linking with uncompiled/unspecialized shaderOpenGL error src/mouseselector.cc:66:Vertex Shader:
 invalid enumerant

src/mouseselector.cc: OpenGL fragment shader Error:
0:1(1): error: No precision specified in this scope for type `vec3'

src/mouseselector.cc: OpenGL Program Linker Error:
error: linking with uncompiled/unspecialized shader

src/mouseselector.cc: OpenGL symbol retrieval went wrong, id is -1

OpenGL error start:
 invalid operation

OpenGL error render:
 invalid operation

OpenGL error start:
 invalid operation

OpenGL error render:
 invalid operation

CGAL error: assertion violation!
Expression : object_list_
File : src/ext/CGAL/OGL_helper.h
Line : 578
Explanation:
Refer to the bug-reporting instructions at https://www.cgal.org/bug_report.html
Aborted (core dumped)

======= END ============

FWIW, noting the warning at the top, I tried using different values of QT_QPA_PLATFORM, but mostly just hung on launch and never displayed anything.

I did not see any similar reports under either Ubuntu's or OpenSCAD's bug trackers.

Thanks!

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: openscad 2021.01-1ubuntu1
ProcVersionSignature: Ubuntu 5.11.0-18.19-generic 5.11.17
Uname: Linux 5.11.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Fri Jun 18 23:12:31 2021
InstallationDate: Installed on 2021-03-08 (102 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: openscad
UpgradeStatus: Upgraded to hirsute on 2021-06-14 (4 days ago)

[Robert Marshall (ki4mcw)]

More, this is on a Lenovo laptop, LCD only (no external monitors, no USB graphics cards on anything like that). Also:

=================

$ openscad --info
QObject::startTimer: Timers can only be used with threads started with QThread
OpenSCAD Version: 2021.01
System information: Linux 5.11.0-18-generic #19-Ubuntu SMP Fri May 7 14:22:03 UTC 2021 x86_64 Ubuntu 21.04 4 CPUs 7.23 GB RAM
User Agent: OpenSCAD/2021.01 (Linux x86_64; Ubuntu 21.04)
Compiler: GCC "10.2.1 20210306" 64bit
MinGW build: No
Debug build: No
Boost version: 1_74
Eigen version: 3.3.9
CGAL version, kernels: 5.2, Cartesian<Gmpq>, Extended_cartesian<Gmpq>, Epeck
OpenCSG version: OpenCSG 1.4.2
Qt version: 5.15.2
QScintilla version: 2.11.6
InputDrivers:
GLib version: 2.67.5
lodepng version: 20180910
libzip version: 1.7.3
fontconfig version: 2.13.1
freetype version: 2.10.4
harfbuzz version: 2.7.4
cairo version: 1.16.0
lib3mf version: 1.8.1
Application Path: /usr/bin
Documents Path: /home/rob/.local/share
User Documents Path: /home/rob/Documents
Resource Path: /usr/share/openscad
User Library Path: /home/rob/.local/share/OpenSCAD/libraries
User Config Path: /home/rob/.config/OpenSCAD
Backup Path: /home/rob/.local/share/OpenSCAD/backups
OPENSCADPATH: <not set>
OpenSCAD library path:
  /home/rob/.local/share/OpenSCAD/libraries
  /usr/share/openscad/libraries

OPENSCAD_FONT_PATH: <not set>
OpenSCAD font path:
  /usr/share/fonts
  /usr/local/share/fonts
  /home/rob/.local/share/fonts
  /home/rob/.fonts
  /usr/share/fonts/X11
  /usr/share/fonts/cMap
  /usr/share/fonts/cmap
  /usr/share/fonts/opentype
  /usr/share/fonts/truetype
  /usr/share/fonts/type1
  /usr/share/fonts/X11/Type1
  /usr/share/fonts/X11/encodings
  /usr/share/fonts/X11/misc
  /usr/share/fonts/X11/util
  /usr/share/fonts/cmap/adobe-cns1
  /usr/share/fonts/cmap/adobe-gb1
  /usr/share/fonts/cmap/adobe-japan1
  /usr/share/fonts/cmap/adobe-japan2
  /usr/share/fonts/cmap/adobe-korea1
  /usr/share/fonts/opentype/font-awesome
  /usr/share/fonts/opentype/freefont
  /usr/share/fonts/opentype/malayalam
  /usr/share/fonts/opentype/noto
  /usr/share/fonts/opentype/urw-base35
  /usr/share/fonts/truetype/Gargi
  /usr/share/fonts/truetype/Gubbi
  /usr/share/fonts/truetype/Nakula
  /usr/share/fonts/truetype/Navilu
  /usr/share/fonts/truetype/Sahadeva
  /usr/share/fonts/truetype/Sarai
  /usr/share/fonts/truetype/abyssinica
  /usr/share/fonts/truetype/arphic
  /usr/share/fonts/truetype/dejavu
  /usr/share/fonts/truetype/droid
  /usr/share/fonts/truetype/font-awesome
  /usr/share/fonts/truetype/fonts-beng-extra
  /usr/share/fonts/truetype/fonts-deva-extra
  /usr/share/fonts/truetype/fonts-gujr-extra
  /usr/share/fonts/truetype/fonts-guru-extra
  /usr/share/fonts/truetype/fonts-kalapi
  /usr/share/fonts/truetype/fonts-orya-extra
  /usr/share/fonts/truetype/fonts-telu-extra
  /usr/share/fonts/truetype/fonts-yrsa-rasa
  /usr/share/fonts/truetype/freefont
  /usr/share/fonts/truetype/kacst
  /usr/share/fonts/truetype/kacst-one
  /usr/share/fonts/truetype/lao
  /usr/share/fonts/truetype/lato
  /usr/share/fonts/truetype/liberation
  /usr/share/fonts/truetype/liberation2
  /usr/share/fonts/truetype/libreoffice
  /usr/share/fonts/truetype/lohit-assa...