I rented Photoshop CC to use on my MAC Book Pro. Received this msg when I launched Photoshop, "3D features require a minimum of 512 MB of vRAM". I was unable to get out of the msg and my screen froze up. In my naivety I then selected "OK" which disabled ALL of my files on my desktop, finder and applications such as IPhoto, etc. Fortunately my data was backed up on an external hard drive. I spent four hours at the Apple Store. Apple had to scrub my computer, install an updated operating system in order to operate my computer again. Afterwards I purchased 4 GB of RAM memory only to encounter the same message from Adobe Photoshop CC upon launching the program again. Instead of hitting, "OK" I force quit my computer. Unbelievable! Why isn't there an option to back out of the message and program? Why isn't there a statement indicating the negative side effects to one's operating system if one's computer doesn't have 512 MB of vRAM? I never thought Adobe products were user friendly. A real flaw on the part of your engineers.