Well, that was one of the problems the first time it failed, but once the spaces were gone, the app wouldn't load the patch neither.

PD seems to locate the folder in:

APP/Contents/Resouces/extra/FOLDER/NECESARY_FILES_AND_PATCH

I've found in the file "org.puredata.pd.plist" a command that seemed trying to open this

../NECESARY_FILES_AND_PATCH/NECESARY_FILES_AND_PATCH

instead of this

../FOLDER/NECESARY_FILES_AND_PATCH

I simply modified that path and everything gone ok, even though I still don't know why it doesn't work fine automatically.

Ignacio