How do you refresh formulas in OpenOffice/LibreOffice Calc?

Simple Recalculation:

Recalculates all changed formulas. If AutoCalculate is enabled, the Recalculate command applies only to formulas like RAND or NOW.

Choose Data - Calculate - Recalculate

F9

Press F9 to recalculate. Press Shift+Ctrl+F9 to recalculate all formulas in the document.

After the document has been recalculated, the display is refreshed. All charts are also refreshed.

The Add-In functions like RANDBETWEEN currently cannot respond to the Recalculate command or F9. Press Shift+Ctrl+F9 to recalculate all formulas, including the Add-In functions.

Source: http://help.libreoffice.org/Calc/Recalculate

References to Other Sheets and Referencing URLs or other external data

See source: http://help.libreoffice.org/Calc/References_to_Other_Sheets_and_Referencing_URLs*

I found that if I pasted in an empty cell from where the formulas worked, then I could edit cells in the inserted column and they would evaluate. Of course, I had to do this for the entire column