Thanks for reporting.
Can you give the results in a terminal of:
echo $DESKTOP_SESSION
echo $XDG_CURRENT_DESKTOP

Do you know what is the report from Plasma?

CC: (none) => yves.brungard_mageia

What is known by Mageiawelcome is for now:
DESKTOP_SESSION
    '01KDE4':'KDE',
    '02GNOME':'Gnome',
    'gnome': 'Gnome',
    'LXDE':'LXDE',
    'MATE':'Mate',
    'Cinnamon':'Cinnamon',
    '23E17':'Enlightenment',
    '07IceWM':'IceWM',
    '26Openbox':'Openbox',
    '03WindowMaker':'WindowMaker',
    '09Fvwm2':'Fvwm2'
If something else is reported, XDG_CURRENT_DESKTOP will be used, and the results will be:
      'KDE':'KDE',
      'XFCE':'Xfce',
      'LXQt':'LXQt',
      'MATE':'Mate',
      'X-Cinnamon':'Cinnamon',
This is coded in helpers.py

commit abe6db5f40edf166966b652e50d6e5d05edbe9d6
Author: Papoteur <papoteur@...>
Date:   Wed Jul 12 21:27:49 2017 +0200

    Update identification of Gnome desktop (mga#21229)
---
 Commit Link:
   http://gitweb.mageia.org/software/mageiawelcome/commit/?id=abe6db5f40edf166966b652e50d6e5d05edbe9d6

commit a2266adf355b5a58ff5c6646e4d3ba1587e775ac
Author: Papoteur <papoteur@...>
Date:   Wed Jul 19 22:54:22 2017 +0200

    Update identification of desktops, suppressing path in DESKTOP_SESSION (mga#21229)
---
 Commit Link:
   http://gitweb.mageia.org/software/mageiawelcome/commit/?id=a2266adf355b5a58ff5c6646e4d3ba1587e775ac

I ask for publication as update of 1.12 release in mag6 and cauldron

Advisory
=============================
Update identification of desktops, suppressing path in DESKTOP_SESSION (mga#21229)
Add internationalization of some URL
Add translation thereof
Replace remaining http:// with https://

mageiawelcome-1.12-1.mga7 submitted to Cauldron, and mageiawelcome-1.12-1.mga6 went to Mageia 6 core/updates_testing.

Advisory:
=========

Updated mageiawelcome package fixes and enhances functionalities

  This release updates the identification logic for desktop environments, fixing
  a misdetection of GNOME (mga#21229).
  It also adds internationalization of some URLs with a first set of translations,
  as well as replaces all http:// links with https://.

RPMs in core/updates_testing:
=============================

mageiawelcome-1.12-1.mga6.noarch

SRPM in core/updates_testing:
=============================

mageiawelcome-1.12-1.mga6

QA Contact: (none) => yves.brungard_mageia
Assignee: rverschelde => qa-bugs

Wait a bit, it didn't build.

Assignee: qa-bugs => rverschelde

To test:
start Gnome, Gnome xorg or Gnome Classic or another DE from GDM, SDDM or another display manager.
In the session, start Magiea Welcome. Check that the DE reported is GNOME, KDE or the used DE.
You can check also that links to documentation work (Urpmi, software management, documentation, ...). At the moment, only French, German and Hungarian are updated, the other work as before or as the English ones.

Assignee: rverschelde => qa-bugs

New package uploaded.

Advisory:
=========

Updated mageiawelcome package fixes and enhances functionalities

  This release updates the identification logic for desktop environments, fixing
  a misdetection of GNOME (mga#21229).
  It also adds internationalization of some URLs with a first set of translations,
  as well as replaces all http:// links with https://.

RPMs in core/updates_testing:
=============================

mageiawelcome-1.13-1.mga6.noarch

SRPM in core/updates_testing:
=============================

mageiawelcome-1.13-1.mga6

Testing M6 x86

BEFORE the update: mageiawelcome-1.11-1.mga6
From GDM
 Gnome [Wayland] MageiaWelcome shows desktop "Gnome"
 Gnome X.org shows "Unknown"
From SDDM
 Gnome [Wayland] MageiaWelcome shows desktop "Unknown"
 Gnome X.org shows "Unknown"

AFTER update to: mageiawelcome-1.13-1.mga6
From SDDM
 Gnome [Wayland] MageiaWelcome shows desktop "Gnome Wayland"
 Gnome X.org shows "Gnome X.org"

Update good. Validating as it is for 64-bit, and there are many to do.
Advisory to follow (from Comment 9).

Whiteboard: (none) => MGA6-64-OK
Keywords: (none) => validated_update
CC: (none) => lewyssmith, sysadmin-bugs

An update for this issue has been pushed to the Mageia Updates repository.

http://advisories.mageia.org/MGAA-2017-0032.html

Resolution: (none) => FIXED
Status: NEW => RESOLVED