Hello--a few days ago Photoshop disabled my 3D features with the new upgrade. I'm perplexed by this because my Macbook Pro has 4G of DDR3 RAM...what am I missing here? And more importantly, how do I resolve this issue?
Moved from the Creative Cloud to the Photoshop forum. They will be able to help you here.
Check the GPU section of your System Info log (Help -> System Info).
Most likely you don't have enough VRAM for the 3D features (which is separate from your system RAM).