If any of you got the Unexpected element: OPEN_TAG error with SoapUI version 5.x.x when adding a new project or importing a wsdl, you are not the only one. I tried everywhere to find a solution for it and changing the proxy settings was all I could find. I tried setting the proxy manually instead of automatic or disabling it completely, neither of that worked.
One thing that worked was uninstalling version 5.x.x and installing version 4.5.x. Drop a note if you were able to make it working with 5.x.x.