The app is not loading in Safari?

When I test the compiled application in Safari (on Windows 7 AND Max OSX) it hangs and only displays a white blank page, and Safari hangs on loading. 

In the developer-tools in Safari, nothing seems to be downloaded under the "Network" tab.

It works in Firefox, Chrome, IE 8, IE 9 without no problem.

Someone had a similar problem or any idea what the problem might be?

I'm using gwt-2.5.1.

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