In the Chart Data table, when I entered a number with a single decimal point, 
it works fine.  However, when I entered a number with two decimal points, OO 
instead applies a completely different, arbitrary value to the chart in its 
place and changes the data field in the table to that value.  To reproduce this:

1.) Select the "Insert Chart" option, either from the toolbar or the "Insert" 
pull-down menu.
2.) Right-click the chart and select the "Chart Data" option.
3.) In the data field of Row 1, Column 1, type exactly the characters within 
the quotations "1.1.1".
4.) Click the "Apply to Chart" button and observe the chart.

When I did this, I got the value 36,892.  I also reproduced this on a Windows 
98 machine.