Comment 1 for bug 1326572

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Marc Defossez (defossez) wrote : Re: Unity does not remember "Show hidden files" option turned off

Open terminal
Type: dconf-editor
     If not installed install it by: apt-get install dconf-editor
When dconf-editro is started, do:
    org --> gtk --> settings --> file-choser
                       Unselect: show-hidden

I've had suddenly the same problem, don't know why or how.
found above solution and it seems to work.