I'm testing Mageia 5 RC3 586 on a AMD Sempron 2300+ PC.

A. Xfce complains it cannot start its own notification because there's another active (this seems the same as bug 12480).

Steps:
1. Get Mageia 5 with Xfce and KDE installed.
2. Install Mate.
3. Read error dialog at Xfce start.


B. After installing Mate, Firefox no longer open folders with Dolphin, but uses Caja -- even though Dolphin is set as file manager in KDE's configuration "Standard Applications". Is this somehow related to 4461 ?

Steps:
1. Get Mageia 5 with Xfce and KDE installed.
2. Install Mate.
3. Open Firefox.
4. Search with Google for some file (e.g.: cheatsheet filetype:pdf).
5. Download said file.
6. After download finishes, click on FF's down arrow and on little folder icon to open folder with downloaded file.

Expected: Dolphin would open the desired folder.

Result: Firefox tries to open Caja. Actually that is not working now, as per bug 15577 . The net result is that FF lost a functionality and longer opens the download folder.

Additionally, as Mageia 4 effectively open Caja with success, it was observed another problem: Alt-Tab to Desktop changes from KDE to Mate (and back)! This "symptom" is yet to be tested in cauldron, as the machine with Mageia 4 is a production one and cannot be used for testing.

C. Log into KDE, call "mate-appearance-properties" (with the intention to change the appearance of certain apps); regardless of the result, a new daemon is kept running: mate-settings-daemon.

Short ouput:
============================================================
[zz@localhost ~]$ mate-appearance-properties 
[zz@localhost ~]$ ps -ef | grep mate
zz       26077     1  1 15:12 ?        00:00:00 /usr/libexec/mate-settings-daemon
zz       26126 18995  0 15:12 pts/1    00:00:00 grep --color mate
[zz@localhost ~]$
============================================================

I know there's a KDE module to adjust gtk apps appearance, but I was specifically testing interaction between desktops and found that.

Sorry for the lack of structure, but a greater picture emerges of desktops not playing the good neighbor one to another. The whole thing might have to do with freedesktop.org standards not being followed...

Some problems possibly happened at install time (or later, when Mate was added); other problems might be occurring at run time -- like running one application and have a daemon starting or running Caja and desktop behavior being modified.

Thanks for any insight.