Analyze (valgrind) doesn't work

In short: The memory Analyzer plugins is not working and i don't know why.

I'm trying to analyse (valgrind) a program on linux using QtCreator. But the menu in qt creator is disabled.

• I've checked the plugins dialogue and the Valgrind plugin is greyed out, but selected.
• I've checked the installation directory and the plugin is there.
• Valgrind is installed (valgrind --version -> valgrind-3.8.1)
• valgrind works (valgrind --tool=callgrind ./myprog)
• I tried the stock version of QtCreator (2.8.1) and a newer installation in ~/bin/Qt.. (3.4.0 and 3.4.1)
• I tried it with a qmake and a cmake project.
• I tried it with Qt and non Qt projects
• I tried to re-enable the QtQuick plugins. This made the menu work and the Analyse icon on the left appeared, but still no valgrind support.
• Somebody suggested to check the valgrind path in Tools -> Options... -> Analyzer, but there is no such icon in the Options and I didn't find it in a tab.