Unable to link test case with user story

Hi,
We have our RQM project where we store test cases linked with the RTC project with development streams.
Within RTC; if I go to Links tab within the user story, I can click Add->Add Tested By Test Case.
Pop-up windows appears and after logging into RQM, I'm able to choose the test case. However, clicking on OK or Cancel button just doesn't do anything. I.e. I'm not able to link user story with the test case from eclipse based RTC client.

Note that I'm able to do this using web based RTC client.

Is this known problem, anybody know about the fix?

Thanks.