Aww, mod 1.4 isn't mod 1.3 savegame compatible it seems. It crashes on me when I click on my save (not load, just click).
Either way, this mod is awesome! I worked my way up to Duke of Mecklenburg from Count of Lubeck with the aid of a Prince of Denmark, mercenaries no longer a shortcut, but rather irritated at HRE gobbling up the pagans to the east of me / north of Poland, one ruler at a time. It was rather odd seeing Poland completely occupied by pagan for decades, and they did not lose a single province, hmm.