NUnit Tests aren't reported

After upgrading to TeamCity 10 we encountered the issue that TeamCity does not show

the results of the executed NUnit-Unittests. According the the BuildLog, all tests are executed but

there is no reporting in the Web-Interface. All we see as Result in the History ist Success, even if

there are failed tests.

Is this a Bug of Version 10 or do i have to change my configuration.

BTW: i use the NUnit Buildstep to run the tests.

Regards,

Stefan