Hi,

I keep a spreadsheet as xls files with Calc from OpenOffice. Each sheet is a
month, and lines are days with hours work. It has sheets from June 2007 till May
2009 ( it counts 23 shets ). On every morning I open it, put arriving hour,
tasks to do/done and on evening the hour I leave. Save/close spreadsheet, then
close PC. Unfortunately yesterday I have surprise to have empty sheets for last
months starting from Sepmtember 2008! Content for that months was lost. Other
tools like MS Excel Viewer popups an error in file and refuse to open. Calc
opens it, but no content. The problems also happens in January. I create a new
file copy/past valid content and now it happens again. I may attach the bad file
as long as I will find out how.