I am using Excel 2003 with an excel add-in for SQL Server Analysis Service. The following problem only happens when the add-in is installed. And it happens on multiple machines with the exact same setup.

You can take a blank workbook, merge a couple of cells togther. Lets say cells cells D10:E10:F10 are merged as one cell. You can click on any column and it will highlight just that single column all the way down the workbook, but if you click on column D or E or F, it will highlight D, E, F as one column.

If anyone has any ideas please let me know. Removing the add-in is not an option.