Turning Autocompletion OFF in Gnumeric

[T. Demand <wg m1box com>]

Is there any way to REALLY turn the autocompletion off in Gnumeric? 
In the Gnumeric preferences, under Tools, the autocomplete check box is 
unchecked. 

Nevertheless, when I type something in a cell, it autocompletes. Of course it 
never does this in the way I need it, so I would really like to have it utterly, 
absolutely and totally OFF, but there is apparently no way...

I am using Gnumeric 1.10.1 which comes from the repositories of ubuntu lucid
Thank you