I'm using silverlight spreadsheet. It is working fine with default Regional format settings English- India.
But when I changed the Regional Format to Spanish(Bolivarian republic of Venezula), I'm getting the following exception at InitializeComponent
"The invocation of the constructor on type 'Telerik.Windows.Controls.Spreadsheet.FunctionsProvider' that matches the specified binding constraints threw an exception. [Line: 39 Position: 54]"
I got Exception here as well, after changing my regional setting. Try to open the below links in IE.