Yes, Elton. In Regional Options, I've specified comma as decimal symbol both in the "Decimal Symbol" field of the Numbers tab and the "Decimal Symbol" field of the Currency tab. In addition, the "Digit grouping symbol" field in the numbers tab contains a space (all these settings are default if you choose "Norwegian (Bokmal)" as locale). After these changes I even restarted the PC, but the scaling still didn't work.
Any ideas?