Hi Okrim - most likely, you are seeing a problem that is caused by iCloud - do you have this installed? Please see this thread for a discussion of the problem and how to fix it -
We are working on a fix for Rhino, it will be in SR 10 - this problem has delayed release of SR 10 but it should be quite soon- you can get the SR10 release candidate by setting Options > Updates and Statistics > Update frequency to ‘Release candidate’. Once you have this installed, use the testDecimalPoint command to fix the locale problem. Or, completely uninstall iCloud, if you have it.
-Pascal