It takes longer than expected to display the Data Export dialog, freezes sometimes while preparing it and cannot be cancelled.
Steps to reproduce:
CREATE TABLE toad_test AS
( SELECT ROWNUM AS r FROM dual CONNECT BY ROWNUM <= 2000 );
Show Data in describe window.
Select all rows and "Create insert statements for selected rows".
This takes about ten seconds for me.
When I close the Describe dialog and repeat steps 2 and 3 it happens sometimes that updating the scrollbar stops after some seconds and/or that die Data Export dialog is displayed behind the Describe window.