It is an Excel spreadsheet with a lot of data (my training records, speeds, distances, averages etc.) that are presented graphically (trends etc.) at the beginning of the spreadsheet. Opening the spreadsheet with Libre works OK for a while (some small imperfections). After several days/weeks of opening, adding and closing, all the charts disappear and become blue rectangles of the same size, with a smaller white rectangle inside. Nothing I do will restore the images. OS Windows 7 English. Calc latest version English
