Same problem on Ubuntu 21.04. started gnome-font-viewer from terminal the 
window opens but is unresponsive. closing it I have the crash and a message:
corrado@corrado-n8-hh-0101:~$ gnome-font-viewer

(gnome-font-viewer:4532): Gdk-ERROR **: 08:22:36.317: The program 
'gnome-font-viewer' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadIDChoice (invalid resource ID chosen for this connection)'.
  (Details: serial 1502 error_code 14 request_code 130 (MIT-SHM) minor_code 5)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the GDK_SYNCHRONIZE environment
   variable to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
Trace/breakpoint trap (core dumped)
corrado@corrado-n8-hh-0101:~$ 

corrado@corrado-n8-hh-0101:~$ apt policy gnome-font-viewer
gnome-font-viewer:
  Installed: 3.34.0-2
  Candidate: 3.34.0-2
  Version table:
 *** 3.34.0-2 500
        500 http://archive.ubuntu.com/ubuntu hirsute/main amd64 Packages
        100 /var/lib/dpkg/status
corrado@corrado-n8-hh-0101:~$ inxi -SCGx
System:    Host: corrado-n8-hh-0101 Kernel: 5.8.0-25-generic x86_64 bits: 64 
compiler: gcc v: 10.2.0 
           Desktop: GNOME 3.38.2 Distro: Ubuntu 21.04 (Hirsute Hippo) 
CPU:       Info: Quad Core model: Intel Core i5-1035G1 bits: 64 type: MT MCP 
arch: Ice Lake rev: 5 
           L2 cache: 6 MiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
bogomips: 19046 
           Speed: 813 MHz min/max: 400/1000 MHz Core speeds (MHz): 1: 813 2: 
998 3: 989 4: 997 5: 966 
           6: 980 7: 954 8: 974 
Graphics:  Device-1: Intel Iris Plus Graphics G1 vendor: Dell driver: i915 v: 
kernel bus ID: 00:02.0 
           Device-2: Realtek Integrated_Webcam_HD type: USB driver: uvcvideo 
bus ID: 1-6:3 
           Display: x11 server: X.Org 1.20.9 driver: modesetting unloaded: 
fbdev,vesa 
           resolution: 1920x1080~60Hz 
           OpenGL: renderer: Mesa Intel UHD Graphics (ICL GT1) v: 4.6 Mesa 
20.2.6 direct render: Yes 
corrado@corrado-n8-hh-0101:~$

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-font-viewer in Ubuntu.
https://bugs.launchpad.net/bugs/1845362

Title:
  gnome-font-viewer crashed with signal 5 in _XEventsQueued()

Status in gnome-font-viewer package in Ubuntu:
  Confirmed
Status in gnome-font-viewer package in Debian:
  New

Bug description:
  Reproducible crash (tested on Ubuntu and Xubuntu) or freezing of
  application during ISO testing of a live-session.

  Application will crash if there is an attempt to close it or scroll
  through fonts. On one occasion my laptop was rendered unusable when
  Firefox was launched while trying to report the crash to Launchpad.

  After the bug report has been sent gnome-font-viewer will freeze when
  automatically restarted. No fonts are displayed.

  Work around
  -----------
  gnome-font-viewer appears to start correctly when started from the command 
line of my Ubuntu 20.04 installation. Then subsequent attempts to start the 
program succeed when started from the dock or the Application Overview.

  I have found that this work around wasn't necessary when using Xubuntu
  20.04.

  ProblemType: Crash
  DistroRelease: Ubuntu 19.10
  Package: gnome-font-viewer 3.34.0-1
  ProcVersionSignature: Ubuntu 5.3.0-10.11-generic 5.3.0-rc8
  Uname: Linux 5.3.0-10-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  CasperVersion: 1.416
  CurrentDesktop: XFCE
  Date: Wed Sep 25 17:34:17 2019
  ExecutablePath: /usr/bin/gnome-font-viewer
  LiveMediaBuild: Xubuntu 19.10 "Eoan Ermine" - Beta amd64 (20190925)
  ProcCmdline: gnome-font-viewer
  ProcEnviron:
   LANGUAGE=en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  Signal: 5
  SourcePackage: gnome-font-viewer
  StacktraceTop:
   ?? () from /lib/x86_64-linux-gnu/libX11.so.6
   ?? () from /lib/x86_64-linux-gnu/libX11.so.6
   _XEventsQueued () from /lib/x86_64-linux-gnu/libX11.so.6
   XPending () from /lib/x86_64-linux-gnu/libX11.so.6
   ?? () from /lib/x86_64-linux-gnu/libgdk-3.so.0
  Title: gnome-font-viewer crashed with signal 5 in _XEventsQueued()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  separator:

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