NEED EMULATOR HELP

I have PCSX reloaded on my Mac, but for some reason this error keeps happening. It plays the game but it has this weird blinking thing over it all the time. What am I doing wrong?
If it matters, I have a Mac. And also, I have tried using ISOs and the actual CD roms for the games and both have caused this problem...
http://www.youtube.com/watch?v=naiBnJPdoFc
that is the video of what is happening

I think I remember something similar happening when i first tried it, but that was on my old laptop, what plugins are you using and what are your system specs?

Hi,
Im not exactly sure. I have a Mac Book Pro (I got it in June so its very new) and I am using PCSX reloaded. Im not sure what you mean by plug-ins, im not very computer-smart.