The creation of temp directories in class SceneIO fails on some dart clients. Perhaps this is caused by multiple processes (different tests which all use the SceneIO class) which try to use the same directory.

Already tried different ways to solve this problem in T7928.

Different tests of classes which use SceneIO fail depending on the method the temp path is generated.

The NavigationToolTest is disabled because of this problem which only occures on the linux dart client and with this test at the current state. See the error output here: http://cdash.mitk.org/testDetails.php?test=1290466&build=19382

Please reactivate the NavigationToolTest if the bug is solved.