Groups Model Randomly Disappears In the Admin View

I have a very strange problem that I am having difficultly in
debugging. In my application I have registered two models, each of
which contains two classes. When I go to the admin view, the groups
class from the auth model sometimes disappears. If I keep refreshing,
it will appear then disappear almost randomly. Does anyone know what
the cause might be or how I can debug this. I am using Django v1.2.5.

Thanks,

Laurence

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