objects instead of proxies

hi,

I have a strange behavior on my development system.
After switching between different versions of our product on my 
develogment system and using the same Data.fs, 
some_object.absolute_url() does not return the proxy_url but the 
real-object-url, so instead of ../campus/students/ I get
../campus/students/1313965434__0001, of course that screws up the whole 
application.

Once that phaenomen shows up, I did not find any way to revert it.

Any hint what could cause this behavior and howto avoid it, is very welcome.

-- 
Gruß Joachim

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