Woah... This shouldn't be happening..

[Snuffalofagus]

For the key problem: Whaaaaaa? Could you please be a little more descriptive of what you mean?

For the floor problem: I'm using a masionbase floor (primitive). When I first tested it out, I actually went back to make sure I saved it, then I saved it several times over. Tried it again, and they still disappeared, I'm pretty sure I didn't undo anything.

For the Credits problem: The door itself isn't a swing door, it's a level door, I had another thread with about a length of 5 pages with people trying to help me out, but none of it seemed to work.
Last resort would be me making it a collide area instead of an interactive area, but I really wanna try interactive if possible.