Iceweasel and Icedove not showing main window

Hi,
After upgrading from testing to unstable my mozilla apps are not showing
their main window.
The processes are running, icedove even ask me for my email password but
their's nothing else.

I tried to remove old .mozilla and .mozilla-thunderbird from my home
directory but it did not help.

I also downloaded firefox from mozilla.com and it works.

Has anyone an idea about what's wrong?

Thanks,
Fabrice

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