[MapProxy] mapproxy problem.

[Raffaello Bertini]

Hi there, i was able to configure mapproxy with isapi-wsgi for mapnik
render..
now I've "magically" found problems on render with the same configuration.
mapnik works well
mapnik yaml config is right and found mapnik layer
but the only render I get is a blue screen.
i tried the same configuration with the serve-develop and it's work well.

I tried with the demo mapnik that's use openlayers...

somebody where's the problem?

thanks in advice..
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