Video can be seen now but what 's the "graphic bug" you're talking about? The only thing I can see from your video is a tiny font size being used. If that's your problem, pressing your volume buttons will solve that.
But, is some way to rebuild the cache, if i have another similar problem like this? or just if i delete all the .cache content, then it's rebuild alone?
Pretty much yeah, that folder has all startup images for applications, and they'll create them later (xterm does it at startup, clock app does it when you hit X, etc...)