Other add-ons remain enabled?
After you enable them, then restart IE10, do they remain enabled?
You do not accidentally start IE with no add-ons? (Just checking possibilities; something is disabling these add-ons.)
Other add-ons remain enabled.
After enabling Acrobat and Shockwave, they stay enable until pc is shut down.
However, opening and closing IE 10 does not cause them to become disabled.