Gnome Flashback Metacity crashes and logs me out at login. Flashback Compiz runs OK.

[David A. Kra]

While modifying the Gnome Flashback Metacity panels:
I moved the top panel to the left. OK
Was changing which applets were shown, removing some, adding some.
The panel shifted almost off-screen, then flickered several times.
I got a display message that a problem kept happening, Gnome could not continue, and I would be logged out.
When I log in again with Flashback Metacity, this happens immediately.
Writing this up from Flashback Compiz.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: gnome-panel 1:3.44.0-1ubuntu1
ProcVersionSignature: Ubuntu 5.19.0-38.39~22.04.1-generic 5.19.17
Uname: Linux 5.19.0-38-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: GNOME-Flashback:GNOME
Date: Sun Apr 9 23:08:18 2023
GsettingsChanges:
 b'org.gnome.gnome-panel.layout' b'object-id-list' b"['menu-bar', 'show-desktop', 'workspace-switcher', 'indicator-complete', 'battstat', 'workspace-switcher-0', 'workspace-switcher-1']"
 b'org.gnome.gnome-panel.layout' b'toplevel-id-list' b"['top-panel', 'bottom-panel']"
InstallationDate: Installed on 2023-04-09 (0 days ago)
InstallationMedia: Ubuntu 22.04.2 LTS "Jammy Jellyfish" - Release amd64 (20230223)
SourcePackage: gnome-panel
UpgradeStatus: No upgrade log present (probably fresh install)

[David A. Kra (dakra137)]

The message when logging in to Flashback on Metacity:
Oh no! Something has gone wrong.
A problem has occurerred and the system can't recover.
Please log out and try again.

Situation did not change after:
from Ubuntu on x Windows:
sudo apt reinstall gnome-session-flashback

or using
Gnome Tweaks 42.beta
Reset to defaults