theme not working after update fron 2.0 to 2.1.3

Hello everybody, after the update I am not able to have any default theme working correctly.
I've already deleted the *.ini files from cahce folder, all the forum functionality works fine, disabling plugins does not help.
The only working theme is bittersweet, (I suppose it's because of the 100% width)
can you give me a suggestion where i should check?
thank you very much for any help.
you can see the forum here: http://www.residenzebroni.it/
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see http://vanillaforums.org/discussion/26685/vanilla-2-1-stable-released/p1
have you followed these steps.
what do you mean by default theme?
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.
thank you, I've verified everything and i noticed that the /applications/dashboard/views/default.master.php was still there.
Now everything works fine.
THANK YOU VERY MUCH.
bye