All the text goes blank when WPF app(v4.0) runs on spanish window7(64 bit)

In the window there is a textbox with text set in xaml only. code behind file has 开发者_运维知识库no logic. in that case, when the application starts , the textbox is empty. Any reasons for it??

The only thing that comes to mind is a font substitution issue. If the particular font family used in the application is not present in any form on the destination OS then there may not be an appropriate font replacement for the application to render with. What typeface are you using for the text? Have you considered one of the default typefaces which ship with Windows?