At first, I wanted the title to be “KArm is pathetic”, but I decided the title to be more informative.
I have switched to KDE because of this single application which was supposed to perform a simple task for me. I've switched the whole graphical environment and it turned out that the key application not usable because it loses data.
KArm was supposed to count the time that I spend on each desktop, so I could see the monthly totals. Bur every time I reboot the time values are different. And my billing was supposed to base on that! Phew.