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.
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.
Bubble charts are created differently than the way it is in Excel. In excel the data point data is read vertically and in RadSpreadsheet - horizontally.