Let's take a look Franco. Problems are usually solved quickly. Please upload the PORTABLE project to a free server, make it public and link it here or in a private message (PM).
We don't need the exported result, just the PORTABLE project folder.
Here are detailed, easy instructions... http://nch.invisionzone.com/topic/23659-tips-for-getting-help-on-this-forum/
If it contains sensitive material link it in a personal message (PM). Click the envelope above. It won't be passed on or retained. Use FILE|SAVE PORTABLE PROJECT AS, not simply SAVE PROJECT, and don't forget to share it.