Opening file with Safari

Hello all,

If found out that Safari is not downloading files with my simple Vaadin code. All other browsers have no trouble.

My really basic code / Vaadin 7.6.4 :

StreamResource resource = new StreamResource(...);

getPage().open(resource, "_new", true);

Same behavior under Windows and MacOS.
Safari seems to download something, but nothing is displaying and download folder stays empty.

Any idea ?