Montegrappa Fortuna Rainbow Fountain Pen

Hey All, I just got the pen from the latest drop, it's very beautiful and feels well built, but I am having trouble getting it to write. First I tried with one of the included cartridges, but no matter how long I waited, ink would not flow. Then I swapped to the converter, and inked it up with some Lamy Black I had around. Still no luck. I even dumped the ink a couple times by turning the end of the converter, as suggested in the manual. I can only get the pen to write if I reverse it, but even then I have to apply some pressure. Anybody have an idea what could be wrong? Is there anything I can try in order to make it write? Thanks, Daniel