Comment 28 for bug 916903

This is not the only cause of the problem, but according to http://lists.kde.org/?t=129170918700001&r=1&w=2 some KRunner queries hang virtuoso-t. Hence, opening up KRunner and disabling the search plugin (wrench -> uncheck "Nepomuk Search") will work around the problem.

It is *not* a fix, it merely prevents the issue from appearing.