Oh it's some days I feel I have some problems in my unity which never happened before. I use Ubuntu 12.04 and I unlock the Libreoffice from my unity. when I open the software Libreoffice and after when I minimize it I can't find Libreoffice icon or sign in unity to do something about it. I have not to minimze it or lock Libreoffice to unity. I have this problem for some other softwares like "Gespeaker". What do u suggest?