Hi Clockwerk.
1. Sounds like your camera object (if you have one) has solid behaviour and is colliding with the blocks.
2. Set gravity to 0 in the side panel of any object you would like to ignore gravity.
3. That tutorial is up to date :) Its the one I learned from.
(Its much easier to get help Ive found if you provide a cap.x, that is a project saved as a single file then linked through dropbox).