seeing more people encountering this - thought I'd share my observations:
- did not see this for a few weeks now
- toyed around with nextcloud for a bit yesterday (the new desktop sync client)
- also tried to connect a (hacked) amazon fire hd10 tablet (which failed, also 
tried to get connection using gMTP, then left my system to sleep/idle)
- came back to the invisible/unclickable thingie
- alt-f2 + r gets rid of it as usual

last journalctl says:
(especially the last three entries seem interesting)


Sep 04 11:09:45 hostname gvfsd[54716]: A connection to the bus can't be made
Sep 04 11:09:45 hostname gvfsd[56942]: A connection to the bus can't be made
Sep 04 11:09:45 hostname gvfsd[56925]: A connection to the bus can't be made
Sep 04 11:09:45 hostname gvfsd[1976]: A connection to the bus can't be made
Sep 06 12:00:03 hostname gvfsd[120538]: Device 0 (VID=18d1 and PID=0281) is 
UNKNOWN in libmtp v1.1.17.
Sep 06 12:00:03 hostname gvfsd[120538]: Please report this VID/PID and the 
device model to the libmtp development team
Sep 06 12:00:03 hostname gvfsd[120538]: Error 1: Get Storage information failed.
Sep 06 12:00:06 hostname gvfsd[120538]: PTP: reading event an error 0x05 
occurred
Sep 06 12:00:07 hostname gvfsd[120538]: Android device detected, assigning 
default bug flags
Sep 06 15:08:14 hostname dbus-daemon[1189]: [system] Activating via systemd: 
service name='org.freedesktop.Avahi' unit='dbus-org.freedesktop.Avahi.service' 
requested by ':1.552' (uid=1000 pid=42440 comm="/usr/libexec/gvfsd-dnssd 
--spawner :1.3 /org/gtk/g" label="unconfined")
Sep 06 15:08:15 hostname gvfsd[1927]: A connection to the bus can't be made
Sep 06 15:08:15 hostname gvfsd[5385]: A connection to the bus can't be made
Sep 06 15:08:15 hostname gvfsd[8198]: A connection to the bus can't be made
Sep 06 15:08:15 hostname gvfsd[40339]: A connection to the bus can't be made
Sep 06 15:08:15 hostname gvfsd[42440]: A connection to the bus can't be made
Sep 06 15:08:15 hostname gvfsd[8448]: A connection to the bus can't be made
Sep 06 15:08:15 hostname gvfsd[50589]: A connection to the bus can't be made
Sep 06 15:17:00 hostname polkitd(authority=local)[1215]: Operator of 
unix-session:2 FAILED to authenticate to gain authorization for action 
org.gtk.vfs.file-operations-helper for unix-process:7445:35881 [/bin/sh -c 
pkexec /usr/libexec/gvfsd-admin "$@" --address $DBUS_SESSION_BUS_ADDRESS 
gvfsd-admin --spawner :1.3 /org/gtk/gvfs/exec_spaw/2] (owned by 
unix-user:username)
Sep 06 15:17:00 hostname pkexec[7446]: username: Error executing command as 
another user: Request dismissed [USER=root] [TTY=unknown] [CWD=/home/username] 
[COMMAND=/usr/libexec/gvfsd-admin --spawner :1.3 /org/gtk/gvfs/exec_spaw/2 
--address unix:path=/run/user/1000/bus]
Sep 06 15:17:00 hostname gvfsd[7446]: Error executing command as another user: 
Request dismissed
username@hostname:~$ ^C

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1824874

Title:
  undismissable, unclickable authentication dialog left on screen (top-
  left corner) after policykit authentication [pushModal: invocation of
  begin_modal failed]

Status in GNOME Shell:
  Unknown
Status in gnome-shell package in Ubuntu:
  Triaged

Bug description:
  In disco, when policykit prompted me for a password in order for
  update-manager to dispatch instructions to aptdaemon to perform
  package updates, the password dialog remained on the screen after I
  clicked 'authenticate'.

  The window is not clickable, it appears not to even be a window -
  mouse presses are received by the window underneath.  The exception is
  that the 'cancel' button is active and receives mouse events - but
  clicking it does nothing.

  This may be a gnome-shell issue rather than policykit.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: policykit-1 0.105-25
  ProcVersionSignature: Ubuntu 5.0.0-8.9-generic 5.0.1
  Uname: Linux 5.0.0-8-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Apr 15 13:14:33 2019
  InstallationDate: Installed on 2010-09-24 (3125 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 
(20100816.1)
  SourcePackage: policykit-1
  UpgradeStatus: Upgraded to disco on 2019-04-11 (3 days ago)

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