This is difficult to reproduce, but I’ve experienced it many times with a Calc spreadsheet (4.1.2.3) with several sheets; most sheets were initially created via a copy-paste (formulas included) from a “mother” sheet.
Now, when I change the sheet data, the formulas are (sometimes) not updated, even if I turn off “autorecalc” and I run a explicit “recalculate”.
Here’s a video I made: http://www.youtube.com/watch?v=xc9-nF8UBik
Notice how the calculated cell should display 0 (it shows that result if I copy the formula verbatim into another cell), but it sticks to the original value, even after I change the cell format, or reference the cell in another cell; it recalculates the correct value only when I make some trivial change to the formula (eg, append “+ 0”)
This is extremely annoying, it basically means you cannot trust your data in the spreadsheet.
Is this a known issue? Is there some workaround?