Linux Gnome Desktop Windows Decoration Disappeared

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Sometime when I logged on to my Gnome Linux desktop I noticed that windows decoration disappeared i.e. minimize / maximaize / close buttons and other decoration gone. How do I fix this annoying problem under Fedora / Mint / Debian / Ubuntu Linux gnome desktop?

Gnome Volume Control: Disabled Sound Themes

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Problem is that every time I click something I get annoying sound from computer speaker. So I tried to disable or set new sound theme by visiting System > Preferences > Sound. The Sound Theme tab is greyed out. Sound itself is not working and I can only get annoying sound. How do I fix this problem under Debian or Ubuntu Linux gnome desktop system?