After upgrading to Ubuntu 13.10, which upgraded kdevelop to 4.5.1, I see the following error when I start kdevelop:

Could not start process Cannot talk to klauncher: The name org.kde.klauncher was not provided by any .service files.

This is followed by another error:

Unable to load the project file /home/drew/foo/some-project.kdev4

The filesystem panel is not populated:

...and the File Open dialog shows no files or folders:

Under Ubuntu 13.04, I'd upgraded to a newer version of kdevelop than the default repositories has (4.3.x I believe) and I had to run kdevelop as root in order to make it work correctly. Is it possible that a file was created as the root user, which now causes this problem? I don't know where else to look.