Your Using snippets for feature receivers are incorrect: a feature's Parent (or a parent SPWeb's SPSite) should not be disposed.
http://solutionizing.net/2009/02/08/do-not-dispose-spfeaturereceiverproperties-feature-parent/
Comments:
http://solutionizing.net/2009/02/08/do-not-dispose-spfeaturereceiverproperties-feature-parent/
Comments:
Resolved