Cloned Panel Pages not really cloned, wipe original panel

This has happened twice to me now in the past few weeks, on two different sites on two different servers.

I create a nice panel page with views, then clone it to a new panel, and the original panel is wiped out. The first time I made view changes to the cloned panel and when I checked the original panel those changes had taken effect there also. I got some db errors but did not record them, thinking I had screwed it up. I rebuilt both panels from scratch and wondered what I did wrong.

Now I approached the second site with caution. I made sure to use different tabs for viewing and cloning the panels, and selected no handlers for the cloned panel, and thus the original panel was wiped clean. When i tried saving the cloned panel, the error message was:

user warning: Duplicate entry 'page_tg_folder_internal_panel_context' for key 2 query: INSERT INTO delegator_handlers (name, task, subtask, handler, weight, conf) VALUES ('page_tg_folder_internal_panel_context', 'page', 'tg_folder_internal', 'panel_context', 0, 'a:9:{s:18:\"autogenerate_title\";b:1;s:5:\"title\";s:5:\"Panel\";s:9:\"no_blocks\";b:0;s:6:\"css_id\";s:0:\"\";s:3:\"css\";s:0:\"\";s:8:\"contexts\";a:0:{}s:13:\"relationships\";a:0:{}s:6:\"access\";a:1:{s:5:\"logic\";s:3:\"and\";}s:3:\"did\";s:2:\"23\";}') in /var/www/drupal/includes/common.inc on line 3436.

Please tell me what I did wrong, or confirm this as a bug and warn others not to use cloning until it is fixed because it can wipe out considerable work time.