diff -up cura-lulzbot-3.6.21/cura_app.py.force-x11 cura-lulzbot-3.6.21/cura_app.py
--- cura-lulzbot-3.6.21/cura_app.py.force-x11	2019-12-19 09:00:06.192165885 -0500
+++ cura-lulzbot-3.6.21/cura_app.py	2019-12-19 09:00:21.823877854 -0500
@@ -41,6 +41,8 @@ import faulthandler
 
 #WORKAROUND: GITHUB-88 GITHUB-385 GITHUB-612
 if Platform.isLinux(): # Needed for platform.linux_distribution, which is not available on Windows and OSX
+    # Workaround for invisible window on Wayland and (at least) Fedora 31
+    os.environ["XDG_SESSION_TYPE"] = "x11"
     # For Ubuntu: https://bugs.launchpad.net/ubuntu/+source/python-qt4/+bug/941826
 
     # linux_distro_name = platform.linux_distribution()[0].lower()