Kingdom Hearts HD 1.5 ReMIX [BLES01897]

Hi, i've been playing this game without any problem until Agrabah World. When you have to fight against Jafar the second time I can't see anything, only the interfaces like VT, MP... In a crazy try, fighting with a black screen I could beat him. But in the Little Mermaid World the problem is back, and this time I cant do anything. Can somebody solve this problem??

PS: sometimes the audio is muted too.
PS2: sorry for my English, is not my primary language.