Kontac Config Files

Hi, I found some behaviors in Kontact, that I classify as aleatory, but they seam to manifest when I log out from kde without close Kontact first. Sometimes, some folder's configurations (specially with mailing lists associated) are lost when I close Kontact. Other times, I reopen Kontact and trying to close it, I receive a message stating that my contacts can't be saved cause they are locked. Any ideas why this happens? Regards, Lívio Cipriano