There's a bug in Drupal module Panels v2.0rc1a which you may need to keep an eye out for. If you happen to be using the default_panel_minis() hook to programmatically load minipanels you wonâ€™t be able to edit or export the minipanel once it has been loaded:
The only way Iâ€™ve found to work with the minipanel from that point is to paste the exact same code from the default_panel_minis() hook into the importer. A bit of a bug, you might say.
I havenâ€™t tried any of the other default_panel hooks, but the minis one does at least exhibit this problem.
I'll post a follow-up if I find a fix someone else has committed or end up doing one myself.