Hello There, I am running fedora 26, after update to kernel 4.12.5-300 and all stuff related to, the sound applet disappear when I tried to change volumen, the same thing for brightness applet. Take a look at this post https://unix.stackexchange.com/questions/387197/xfce-sound-volume-slider-disappears-when-clicked. regards. Your desktop is the best !
This isn't an Xfce issue but a problem with the update to GTK3. If you downgrade from 3.22.18 to 3.22.16 the issue is fixed. Just do dnf downgrade gtk3. A bug report should probably be filed with Fedora
This issue also exists on Archlinux. I know it's not specifically an issue with this plugin, since it also occurs on the brightness slider in the power manager applet. I'm not sure which package is causing the issue, so I don't know where the best place to submit a bug report is.
Update: I managed to find this bug report on the Gnome Bugzilla: https://bugzilla.gnome.org/show_bug.cgi?id=786029 A patch to fix this is proposed, though it's argued that instead of fixing this, desktops should switch to the new GtkPopover for their panel plugins, and discard the old method. Yet another example of Gnome making their tools less useful with each release, and claiming it's their vision for the desktop, rather than a bug.
Thanks guys for your answers ! cheers.
Marking as invalid as it's an upstream issue with GTK+ (that has now been resolved).