After that, I made another second version of the same project, directly with AfterEffects.
You shouldn't do that; that tends to confuse Dynamic Link, especially if you name the projects in sequential order, like Project 1, Project 2, etc.
Just use one project with multiple compositions in it, or if you must use multiple projects, start each one from scratch instead of duplicating and renaming.
"...or if you must use multiple projects, start each one from scratch instead of duplicating and renaming..."
I made from scratch these new projects with AECS5, called:
"Montaggio_02_CS5_04_Franzi_AECS5 - Composizione collegata 02.avi" and
"Montaggio_02_CS5_04_Franzi_AECS5 - Composizione collegata 03.avi",
not renamed, nor duplicated.
-But PremierePro and DynamicLink doesn't display those in the window!
I am not sure...
But I have understood that Dynamic Link in PremiereProCS5 works with just one AE project and multiple compositions, not with multiple AE projects!