Fading cores in retroarch 1.6.8 and 1.6.9

Some cores in retroarch 1.6.8 and 1.6.9, even downloading straight through the retroarch, they show in the part of loading colors, but when we select them, they do not appear as loaded as is the case of Mame 2010, ScummVM … started this problem after the retroarch 1.6.8, I’m using the android version, with android 4.4.2.