RVIZ: URDF Model disappears when loaded

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I'm trying to load a simple urdf model into rviz. However, when rviz loads, the model is there for a split second, then disappears. All the status read ok, and rviz shows no problems. I can make the model appear, but only if I change the fixed frame to something non-existent, which then produces many issues. The terminal ready no issues either. I've already tried a common solution to export LC_NUMERIC to en_US.UTF-8, but this doesn't fix the issue.

I'm running ROS Melodic on Ubuntu 18.04.5 LTS through a Virtualbox VM on my Lenovo ideapad 330S (Windows 10).

RVIZ Config File:

Panels:
  - Class: rviz/Displays
    Help Height: 78
    Name: Displays
    Property Tree Widget:
      Expanded:
        - /Status1
        - /RobotModel1/Links1
        - /TF1
      Splitter Ratio: 0.5
    Tree Height: 416
  - Class: rviz/Selection
    Name: Selection
  - Class: rviz/Tool Properties
    Expanded:
      - /2D Pose Estimate1
      - /2D Nav Goal1
      - /Publish Point1
    Name: Tool Properties
    Splitter Ratio: 0.5886790156364441
  - Class: rviz/Views
    Expanded:
      - /Current View1
    Name: Views
    Splitter Ratio: 0.5
  - Class: rviz/Time
    Experimental: false
    Name: Time
    SyncMode: 0
    SyncSource: ""
Preferences:
  PromptSaveOnExit: true
Toolbars:
  toolButtonStyle: 2
Visualization Manager:
  Class: ""
  Displays:
    - Alpha: 0.5
      Cell Size: 1
      Class: rviz/Grid
      Color: 160; 160; 164
      Enabled: true
      Line Style:
        Line Width: 0.029999999329447746
        Value: Lines
      Name: Grid
      Normal Cell Count: 0
      Offset:
        X: 0
        Y: 0
        Z: 0
      Plane: XY
      Plane Cell Count: 10
      Reference Frame: <Fixed_Frame>
      Value: true
    - Alpha: 1
      Class: rviz/RobotModel
      Collision Enabled: false
      Enabled: true
      Links:
        All Links Enabled: true
        Expand Joint Details: false
        Expand Link Details: false
        Expand Tree: false
        Link Tree Style: Links in Alphabetic Order
        back_left:
          Alpha: 1
          Show Axes: false
          Show Trail: false
          Value: true
        back_right:
          Alpha: 1
          Show Axes: false
          Show Trail: false
          Value: true
        chassis:
          Alpha: 1
          Show Axes: false
          Show Trail: false
          Value: true
        front_left:
          Alpha: 1
          Show Axes: false
          Show Trail: false
          Value: true
        front_right:
          Alpha: 1
          Show Axes: false
          Show Trail: false
          Value: true
      Name: RobotModel
      Robot Description: robot_description
      TF Prefix: ""
      Update Interval: 0
      Value: true
      Visual Enabled: true
    - Class: rviz/TF
      Enabled: true
      Frame Timeout: 15
      Frames:
        All Enabled: true
        back_left:
          Value: true
        back_right:
          Value: true
        base_link:
          Value: true
        chassis:
          Value: true
        front_left:
          Value: true
        front_right:
          Value: true
      Marker Scale: 1
      Name: TF
      Show Arrows: true
      Show Axes: true
      Show Names: true
      Tree:
        base_link:
          chassis:
            back_left:
              {}
            back_right:
              {}
            front_left:
              {}
            front_right:
              {}
      Update Interval: 0
      Value: true
  Enabled: true
  Global Options:
    Background Color: 48; 48; 48
    Default Light: true
    Fixed Frame: chassis
    Frame Rate: 30
  Name: root
  Tools:
    - Class: rviz/Interact
      Hide Inactive Objects: true
    - Class: rviz/MoveCamera
    - Class: rviz/Select
    - Class: rviz/FocusCamera
    - Class: rviz/Measure
    - Class: rviz/SetInitialPose
      Theta std deviation: 0.2617993950843811
      Topic: /initialpose
      X std deviation: 0.5
      Y std deviation: 0.5
    - Class: rviz/SetGoal
      Topic: /move_base_simple/goal
    - Class: rviz/PublishPoint
      Single click: true
      Topic: /clicked_point
  Value: true
  Views:
    Current:
      Class: rviz/Orbit
      Distance: 2.1567115783691406
      Enable Stereo Rendering:
        Stereo Eye Separation: 0.05999999865889549
        Stereo Focal Distance: 1
        Swap Stereo Eyes: false
        Value: false
      Focal Point:
        X ...