How to export Panels and Mini Panels with Features?
Make sure the panel was not already added to another feature-module. You need to add the pagemanager stuff (handlers and pages) to the feature too.

BTW the pagemanager status enabled/disabled is set via a drupal variable, so check also strongarm: If i.E. node/%node is enabled, then the variable page_manager_node_view_disabled is set to FALSE.