The error message is: "Could not write tool to tempory directory: C:\Users\admin\AppData\Local\Temp\/8oEMsd"
Examples:
http://cdash.mitk.org/testDetails.php?test=7443117&build=411116
and
http://cdash.mitk.org/testDetails.php?test=7444511&build=411165
This bug was found by tests which use this method. The first step would be to extend the test of mitk::IOUtil itself, so that it detects the bug as well.