Hi Smily,
I had the same issue but we got it working. When you click on "designer", notice that the URL points to localhost and thus it works from the server as it is the local host. However, it does not work from the client. I talked to our Operation department to do the proper configuration - server and installation settings. It works fine now. If yours cannot figure it, I can talk to him to inform you about the required steps. hope it helps
Regards,