I just recieved my new Riva 510 SE and am having trouble with filling the cartridges. I can fill the cartos just fine and they work but i can't get the atty to heat up the filler in the cart to start vaping that. I like cartos better but im not going to waste carts. I don't think i overfilled the thing and i know its not the atty ive already dripped on it and it works beautifully. Little help/advice would be appreciated. Thanks in advance.