Hi! Apologies that I missed this message! I saw it a couple of weeks back but it's been a pretty hectic build up to Christmas on my end. Here's some things to check for:
- Make sure you haven't set the physics to "Cannot be pushed" - If you have an object that cannot move and an object that cannot be pushed collide with one another, it causes one to pass through the other.
- Make sure the collision is not set to a sensor when it's meant to be a solid collider!
Feel free to send me through a build of your game and I can give it a nosey over! (alexjohansson at hotmail dot co dot uk)
Hope you've managed to get to the bottom of it and glad these tutorials are seeing some use!