Assume that you use Microsoft PowerPivot for Excel to import data from a Microsoft SQL Server Analysis Services (SSAS) database to Microsoft Excel 2010. When the imported data contains Georgian characters, you notice that the PowerPivot workbook incorrectly displays Georgian characters as rectangles.Note
Georgian characters are displayed correctly in the Excel workbook and in the formula bar.
To work around this problem, set the font to Arial Unicode MS in Excel, and then restart Excel.
To change the default font for Excel workbooks refer to the following link in Excel Help:
Change the default font in Excel
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.