Created attachment 108971 [details] Proof that charts get drawn incorrectly when x-axis is a date format Bars and columns charts get drawn in ultra thin lines, when the x-axis column is a 'date' format and contains a duplicate month. Create a spreadsheet document, and on the first sheet, enter a data table where the first column contains date values, formatted like dd.mm.yy for example. Insert a few dates, one for each month, e.g. 2.1.14, 3.2.14, 1.3.14, 2.4.14 Create a chart from the table and make the date column your x-axis (LO will most likely do so automatically) Change one date on to force a duplicate month, e.g. change the second value to 30.1.14. The chart will be re-drawn in ultra-thin lines. If you change the value back, the chart will look correct again. And despite different day numbers, the chart's label does not reflect them, but displays 01.mm.yyyy instead for every month. The above does not happen with simple text in the first column. A sample document that shows this bug is attached.
Hi @Frank, thanks for reporting. Your comment it's still reproducible with 4.2.7. I think with the x-axis scaled as dates the issue comes because in this way you are subdividing the x-axis in days not in months, what implies the bar width it's for one day space. I don't know with 3.3 (sorry it's a very old version), but in 4.2.7 changing the scale for x-axis from Automatic to Text solves the issue, because avoids the use of days in x-axis subdivision. Resolves as notabug, please if you are not agree reopen it.