MacbookPro won’t even Start this app

Ive been using this app on MBAir and MacMini for more than an year. I had (almost) no problems during that time but This app does not even launch on MB Pro Retina, 2015, with 10.10.3. Goddamn I un-and-reinstalled few times and still not working. Please fix it because I really need to watch some MKV files!!

Plus, on my MB Air, 2012 mid, 10.10.3 show WHITE screen when I make player “Full Screen” while playing mkv files. please fix it

ChicoYoo about MPlayerX