I had the same problem and finally found out that it was a problem of different locale settings in kde and basic settings. While I had changed the number format in KDE to use decimal points, the locale number format LC_NUMBER was still "de_DE.UTF-8. Adding the line
LC_NUMERIC="en_US.UTF-8" to /etc/default/locale fixed the problem. -- kicker applet 'arythmetic evaluator' has problem with national decimal symbol https://launchpad.net/bugs/38994 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
