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I started migrate from 6 to 7 and strange behavior noticed in FileDownloader class (latest vaadin release). In order to download file through button click, I have to click button twice first time! After button clicked twice next clicks react normal. If we try download file "old style" way(Page.getCurrent().open(resource, "_self", false)) download start immediatly at first time, but UI enters a state after which does not respond to user input. Saves only refresh browser. Has anyone seen or what to do? Thanks.