It's likely https://bugs.kde.org/show_bug.cgi?id=373131
As a workaround, switching to a VT (i.e Ctlr-Alt-F1) and back (Ctrl-Alt-F7) temporarily restores the correct behaviour. Greetings BZ 2016-12-14 11:55 GMT+01:00 Gard Spreemann <gspreem...@gmail.com>: > Hello, > > Some recent package upgrade in Stretch (I'm trying to pin down which) > has caused parts of my Plasma desktop to freeze at seemingly random > intervals. When it happens (every few minutes), all windows continue > to behave normally, and new programs can be started with > alt-F2. However, the desktop area itself, the taskbar and any > notifications become unresponsive. Switching to a console and then > back to X, without doing anything else, makes everything work again > for a while. > > This seems to be exactly what is described in a recent Fedora bug [1]. > > Before I file a bug and investigate further: is anyone else > experiencing the same thing? Does anyone have any idea as to which > upgrade may have caused the problem? I can't believe the update > happened more than a week ago. > > Thanks. > > (I'm not subscribed to the list). > > [1] https://bugzilla.redhat.com/show_bug.cgi?id=1399396 > > > Best, > Gard > >