RT 3.2.2 Query Builder - Delete key does not work

RT 3.2.2
Mandrake 10.0
Perl 5.8.3
Fast CGI
Mysql 4.0.18

The Delete key does not work when deleting elements from the
Query Builder.
When selecting a line and pressing the Delete key, the entire
page refreshes/reloads but the line is still in the Query window.

I do not get any messages in the log files.

Has this problem already been identified ?

John Giles