Problem with autocomplete in 1.8 (win xp)

I have the same issue  described previously
http://www.pgadmin.org/archives/pgadmin-support/2007-09/msg00147.php

In the Query editor, items in the autocomplete drop-down lists cannot be selected by the Enter key,
it just enters (systematically) a newline in the editor window.
You must use the mouse (or the Numerc keypad).
This frustrating bug didn't appear in 1.6/1.7.

My version is 1.8.0, Win XP SP2

Hernán