Hi, may be a bit late for you but I had the same issue.
I edited /admin/information_form.php and commented out a couple of lines to do a quick and dirty fix.
// Decide when to show the buttons (Determine or 'locked' is active)
// if( (empty($info_group['locked'])) || ($information_action == 'Edit')) {
echo tep_image_submit('button_insert.gif', IMAGE_INSERT);
// }
HTH
S