auto-resize guest display greyed out

[aportley]

I'm having a problem with window resizing for my RHEL guest on MacOS host. Auto-resize option is greyed out (though checked). Guest display resolution choices are all 4:3, not the 16:9 for my monitor, and the maximum available is 1024 x 768. When I try to adjust the window size I get unusable margins or scrollbars; the guest window size doesn't change. Any help would be very much appreciated!

Host: macOS High Sierra 10.13.6, 16GB memory, Thunderbolt display 2560 x 1440
Guest: RHEL 7.5 64-bit, 7.8GB memory, Gnome desktop 3.22.2
Virtual Box: 5.2.18 r124319 (Qt5.6.3) . Guest Additions 5.2.18 installed (I hope!)

Some random output from commands taken from other similar threads (run via gnome terminal):

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$ glxinfo | grep OpenGL
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: llvmpipe (LLVM 5.0, 256 bits)
OpenGL version string: 2.1 Mesa 17.2.3
OpenGL shading language version string: 1.30
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 2.0 Mesa 17.2.3
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 1.0.16
OpenGL ES profile extensions:

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$ lsmod | grep -i vbox
vboxsf                 42725  1 
vboxguest             306625  5 vboxsf

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$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768
default connected primary 1024x768+0+0 0mm x 0mm
   1024x768      61.00* 
   800x600       61.00  
   640x480       60.00  

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$ cat /var/log/vboxadd-install.log 

chcon: can't apply partial context to unlabeled file ‘/opt/VBoxGuestAdditions-5.2.18/other/mount.vboxsf’

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$ cat /var/log/vboxadd-install-x11.log 
VirtualBox Guest Additions installation, Window System and desktop setup

[socratis]

00:00:01.055319 File system of '/Users/aportley/VirtualBox VMs/vagrant_default_1539637985104_96762
                /packer-virtualbox-ovf-1538441564-disk1.vmdk' is unknown

You forgot to mention that this is a Vagrant made VM, with the help of Packer. Vagrant is a program that relies on VirtualBox but modifies its configuration files in unknown ways to us. It is not supported on these VirtualBox user forums, they have their own Vagrant support channels. If you are having this problem with a standalone version of VirtualBox (after a complete uninstallation of Vagrant), then we can continue this discussion.