15" MacBook Pro 2.2GHz quad-core i7
4GB RAM
AMD Radeon HD 6750M - 1GB video card
When I first open up the 3D view, it doesn't show me anything. I can click and drag and nothing 'seems' to happen until I move the window: as soon as the window is moved, everything gets updated (which usually means my scene is upside down from clicking around and not seeing anything happen).
I'm new to the program (my interface just arrived today, so I've only been using the software), but the 6.26 version didn't seem to have this issue.