My environment is this
On my desktop I have a top panel with icons for a number of applications like - firefox, konsole, libreoffice, kontact etc.
What I'm about to describe can relate to any of them.
Starting about a week ago immediately after I log on and try to start an application, through the top panel, the system seems to hang and eventually after about 60 secs I get this message box appear, in this example I tried to start Kontact, could equally apply to Konsole, etc.
Either KLauncher is not running anymore, or it failed to start the application
Equally I also get it on Konsole. Always the first application I try after a fresh login. Konsole and Kontact seem to my favourite Apps when I log on!
When I close the message box and try again everything seems to be fine and I can start any application. However, when I try and shut down and click the power icon nothing happens - no dialog appears. So to shut down the system I have to either switch user and force a power down through them. Or start konsole and switch to root and power down from the command line.
This problem effects other users on the system.