This is a minor issue... If a query does a divide by zero the user gets an "Invalid floating point operation" error - which is expected.
...but the NEXT query makes it clear that DBF didn't properly recover from the error. Any query after that causes general instability errors. Here is an example: http://i.imgur.com/vbEDohC.png
Hope that helps. Again, this is just a minor issue I wanted to report but is easy to get around.