why Boinc in kde do not open when first login sometimes?

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http://askubuntu.com – when i startup computer from power of and automatically open in kde boinc sometimes does not work and when i close and open again say that is already open and ask me for a password .. so i have to log out and log in with kde so boinc can start.and it start. this does not happens with unity.. so why boinc at least sometimes does not open when the computer is power on and log in with kde ? (HowTos)