A strange thing happened.
I opened libreoffice and plasma crashed. This is a regular occurrence
since about 10 days that I had hoped would disappear with the arrival
of kde-4.11.1, but it didn't. I closed libreoffice and tried to
switch to another virtual desktop, when I noticed that screen edges
no longer work.
I just updated the system and a new kde-workspaces came, so I thought
this just might be the fix, so I didn't worry about it. I restarted
(not off and boot) the computer, expecting everything to be fine. It
I checked systemsettings and the edges are set to active windows and
desktop grid, but they are shown greyed out, so I thought that
somehow these effects must have become disabled. They didn't. They
are shown as enabled.
I logged out and back in. Still the same.
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I guess I figured it out, but it is strange.
A couple of weeks ago, I noticed that one could use OpenGL3.1 as a
compositing type, so I switched to it. I ran my computer like this for
a couple of weeks and suddenly, last night, there was a strange flash
and suddenly the screen edges no longer worked, windows made an odd
flash as they appeared and other stuff. I noticed that the edge effects
were greyed out.
I investigated further a moment ago and noticed that I had missed, last
night, that desktop effects had turned themselves off. I tried to
reenable them, but they wouldn't turn on. Then, I switched to OpenGL2.0
and tried to reenable desktop effects, and now it all seems to work
like it should.