Barcode wizard (Corel) font problem

I try to make an EAN-13 barcode with Barcode wizard. Barcode itself is fine but instead of numbers under the barcode there is only square boxes. It seems that  the default barcode font OCR-B 10 BT works not at all with my Corel. The same truetype font works fine with MS-Word and Adobe Pagemaker in the same computer!? The font option in barcode wizard is greyed so I can not change the font so I can not make working barcodes at all. I have reinstalled the font with no help. How can I get my Corel to communicate with this font? My colleagues do not have any problems with the font.