Webview issue under vCO 5.5

Hi All,

we have installed a new Windows 2012 Server and vCO 5.5. We import our workflows, actions and webviews from vCO 5.1.

After we open the webview, we get the following error. If we close the page, open it and login again, then it is working and we can start the workflows from the webview.

Has somebody seen this already and have a solution.