Thought I would post that here in case people have the same problem.
Since I've installed WordPress 3.9 I wasn't able to use Duplicator.
I always got a lot of Deploy errors about duplicate entries.
I tried with the developer version. Didn't work.
I was able to make it work by building the package with the mysqldump option.
Works perfect now! Very good plugin that I use a lot. Thank you very much.