I managed to make a local copy run successfully so, I'm pretty sure has something to do with the read only file system of that environment...I'm not sure how I'm gonna debug it (I need to see what files is piwik is writing outside /tmp and /config), but that my next move.

Are you still having this problem @nahueldotme ? Which files / directories are not writable? Did you see any specific error message?

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Ohhh, I'm sorry I forgot to post the solution:I happened because my webserver was blocking access to .json files at piwik directory.

BTW: This tutorial was key to debug it (I order to run js without crashing my browser): http://www.html5rocks.com/en/tutorials/developertools/async-call-stack/

I'm setting this issue as close ;)

Thx for letting us know. Do you remember which .json file(s) was/were blocked?

All (was my fault on webserver settings), but the fist to make it crash, was manifest.json