swi read/1 problem

I have a pl file:

main :-
repeat,
write('> '),
read(X),
(X==quit->true;fail).

Which, if I run from the SWI-Prolog Editor, I get the following error:

17 ?- main.
> test.
ERROR: Stream user_input:2:330 Syntax error: Operator expected
18 ?-

However, if I run from SWI-Prolog, separate from the editor, it works
perfectly.  Is there a bug with the editor, or am I doing something
wrong.

Thanks
Steve