Cannot get loadui NG (no Pro) test opened (ready api! 1.8.5)

At my office I have created a ready api! 1.8.5/soapui NG testcase and want to add a loadui test. Just the standard loadui standard version (No Pro).

It should than open the loadui test and display the headings Global Mtetrics and Test step metrics.

This doesn't happen only the loadui testcase itself is displayed.

I also used a trail license of loadui NG Pro and than the loadui test was opened as expected. 

In 1.9.0 it works as expected.

At home I also have ready api! 1.8.5 and there it works as expected

I believe that it is something in the configuration.

Does anybody has a suggestion where to look?

Thanks,

Ed van Asseldonk