Well actually becoming serious for a post here.

It has been proven that there are forces and sources of energy that cannot be seen, so therefore it can be assumed that the fact that you can see it has nothing to do with it's speed. ie. Can you hear a sonic jet flying by?

Another famous theory is that of Sir Issac Newton in which a change in force requires an equal and opposite force. Which somewhere along the lines means that for converted matter to be corrupted or destabilized you'd have to run into something. A self contained segment of space that has been converted into a form or energy that could possibly travel at the speed of light would also need to be sifted into some sort of 'phase' to use a likely sci-fi term so that it would not collide with anything along the way.