Radiant 0.6.7 install not allowing enable/disable of extensions in admin

I just upgraded my radiant install to 0.6.7 (great work everyone!),
and in the extensions page, I don't get an option to enable/disable
extensions. I am logged in as an Administrator.

Unfortunately I don't have control of the radiant install directly
(shared hosting environment).

Any ideas? Is this a known issue? I didn't see it in Trac.
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