SAP Business Application Studio Workflow editor not opening

Hello, I used to develop Workflows using the Web Ide, now I have to use Business Application Studio to work with Cloud Foundry.

I created, compiled and deployed successfully some workflows, but when I double click on a worklow very often happens that it is opened in text editor and not in the visual editor.
Even clicking with the right button shows me only the text editor option.
When this happens I try to reload the page, to change workspace, to wait even some minutes, to stop the instance and restart it.

But sometimes it is not enogh, this morning is 2 hours that I try, but the editor doesn't appear :-(