Importing a document could result in a big UsedCellRange due to the big range of the imported DataValidationRule cell property. The UsedCellRange calculations should ignore this property. This could lead to a performance diminishment when exporting.

The feature is going to be included in the next official release Q1 2105.

The feature is available in Q3 2014.

The feature will be available in our official release 2015 Q2.

If RadSpreadsheet is shown in RadWindow or in Popup, Filtering dialog throws NullReferenceException.

Error: "We found a problem with this formula. Try clicking Insert Function on the Formulas tab to fix it." appears on the screen when a user tries to:
1. Selects a cell.
2. Inserts Sum formula from the ribbon menu by following Formula --> Auto Sum --> Sum.
3. Selects Range.

A workaround which can be used for the moment is to traverse the TextFragment elements in the affected pages and set their Clipping to null:

foreach (ContentElementBase element in page.Content)
{
    TextFragment text = element as TextFragment;
    if (text != null) text.Clipping = null;
}

Implement Protection feature.