One cannot reference another sheet in a formula by using the UI 

When certain files are imported, an exception with message" is invalid column name" is thrown.

Selecting multiple columns that are not necessarily next to each other leads to incorrect chart series categories. Having the same columns next to each other and selecting all of them with single selection results in a correct chart. Make it possible for the user to make multiple selections and create charts based on them.

When the selection contains a certain combination of text and numbers, the charts dialog throws an exception upon opening.

The EqualToRule does not work the same way in Excel and RadSpreasheet. 

When using string values with this rule, Excel requires using quotes while in RadSpreadsheet the quotes are interpreted as part of the value.  

Right borders are not rendered correctly when there is no value. 

When Bulgarian culture is set and a document with a chart is imported, NullReferenceException is thrown.

Add formula error checking like in Excel

Exporting merged columns to PDF creates unnecessary pages. The created file contains more than 8 MB in size and empty pages. It should create only one page as done in MS Excel.

Selected merged cells jump to the bottom of the selection when it goes outside the visible area.

Spreadsheet :Export/Import of merged cells from several columns leads to - 'A' is invalid row name error

Having more than one rule over a cell range and managing the rules through the "Manage Rules" dialog so they switch priority does nothing and the cells do not update.

Copy-Paste rules action is not translating the rule range.

The fill handle is not working with conditional formatting rules.

New rows cannot be inserted when a rule is applied over the whole column.

Reapplying rule to а different range is not being applied.

The conditional formatting rule is not applied over shifted cells when a new row or a column is inserted or removed.

Escape key does not close the Insert Chart dialog.