Hello,
When I left click the volumn slide control to change the volume, it will
instantly disappear, making it impossible to adjust volumn with mouse.
The volumn control is provided by xfce4-pulseaudio-plugin-0.2.5-2 I think.
The same happened to brightness slide control, provided by the power
manager icon, i.e. right click the power icon, then adjust screen
brightness with mouse by left clicking it, the slide will also instantly
disappear.
This isn't the case with a default F26 install I just did today, but after
a full system update with 'dnf update', the problem started.
I probably should file a bug for this, but it's not clear to me which
component is the problem yet.
Any ideas? Thanks.