http://forums.worldofwarcraft.com/thread.html;jsessionid=06A1BA0A7A64F177610432002053FC4C.app05_08?topicId=10971929880&sid=1
Looks like the workaround is to use the following command:
/run LoadAddOn("AddonA") LoadAddOn("AddonB")
Where AddonA and AddonB are the names of the addons themselves, or you might be able to use an Addon Manager like ACP: http://forum.twilightonalex.com/index.php?topic=6001.0
That gives you a button to manually load them.