The steps below is showing how to reproduce the failure :

1.Create a 5x5 sea blue color style table (this is the default color in my 
  installation)
2.Type some text in all the cells in the top row of the table.
3.Highlight all cells in the top row of the table and click on the Table 
  Properties on the table toolbar
4.Change the font size from the default value (18-point) to the valid value of  
  6 point and hit OK.
5.Click on the border of the table to select the whole table, and press the Del 
  button on the keyboard to delete the table.
6.Exit OpenOffice. A dialog-box will appear asking whether to save the file or 
  to discard the file. Click on the Discard button, and exit OpenOffice.

Result: 

The sizes of the fonts in the top row show a decrease. However, after exiting, 
an error message informing OpenOffice crash appears. This is the error 
message : 
“Due to an unexpected error, OpenOffice.org crashed. All the files you were 
working on will now be saved. The next time OpenOffice.org is launched, your 
files will be recovered automatically.â€
Thereafter, OpenOffice restarts, shows the bug-reporting screen. On clicking 
the Cancel button to skip the bug-reporting step, OpenOffice displays the start-
up menu and waits on the user to select an application from a list, to launch. 
OpenOffice does not exit  . 

My configuration is
OOO 3.0.1 
Window Vista 
Laptop:Toshiba Genuine Intel CPU T2080 1.73 GHz
Memory: 2 GB 

Also , I used another configuration 
OOO 3.0.1 
Window Vista 
Desktop:HP Intel CPU AMD Dual Core proessor 2.60 GHz
Memory: 3 GB