Created attachment 65134 [details] a screenshot of the cell of the function when I open the sheet
This got submit too early, sorry. I use the function \months to calculate the number of months between then a date and the current month. The function give me a good answer but when I save, quit and reload the sheet, I get a #name! error on the square and I need to modify the function to get a result. Not a big deal for me since it's a personal sheet but still a bug I wanted the report.
On pc Debian x86-64, with 3.5 branch updated today, I didn't reproduce the problem. Could you give a try to the last LO version 3.5.5 and tell us if you still reproduce this problem ?
Did you save in .xls ? MONTHS function is not defined in Excel (at least in old versions, 2003 and <)
No more feedback from bug reporter. Julien was not able to reproduce the issue. Maybe Gerard's guess with the .xls file is right. Setting to "notabug". Michael, if this problem is still reproducible with LO 4.0 and using the open document format, feel free to re-open this bug.