Making DBMS_OUTPUT.PUT_LINE work properly with Oracle 10g's 32K limit?

I'm using Oracle 10g which expanded the size limit on a PUT_LINE from 255 to 32K.  However, DBVisualizer still seems to have the 255 limit.  Consider the following cases:

-- This says "command processed but no rows were affected" - no DBMS output is produced.  Remove 1 character from the string and it works
DECLARE
BEGIN
  DBMS_OUTPUT.PUT_LINE ('1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456');
END;


-- Things work the same way using a PUT, then a PUT_LINE.  Once you cross 255 characters, no error or output is returned
DECLARE
BEGIN
  DBMS_OUTPUT.PUT ('1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890');
  DBMS_OUTPUT.PUT_LINE ('123456');
END;

Hopefully this is something that can be fixed in a configuration file.  If not, I guess I'll just have to wait for a new release.

Thanks for any help,
Sammy