Hi everyone, I got a problem (and related panic ). I got a Mac Pro 4.1 early 2009 (El Capitain 10.11.6) with an NVIDIA Geforce GTX 960. Everything worked fine til the last Security Update 2018-002. After that every moving object on my screen is flickering and I can't work anymore. Another person installed the Geforce GTX 960 on my Mac, so I'm not able to figure out where is the problem. I searched for exaustive topic but I wasn't able to find the right one. I'm not an expert like most of you out there, I apologize in advance for that! What happened? It's a question of drives? Have I to unistall and re-install the graphic card? Many thanks for your time and help!