I have been trying to get conditional formatting to work. It works fine on my gentoo desktop. I've followed the same steps using the N900 version but cannot get the "<- Add" button to activate itself.

Steps:

• Highlight a bunch of cells
• From menu select Conditional Formatting
• Edit condition: Cell value is >= x
• Edit x: Sheet1!F1
• Applicable Style Components left on default (only "Background")
• Went into "Edit Style" and changed background colour
• Style Overlay changes to (defined) to confirm style is set
• The "<- Add" button is still greyed out.