Lurch
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I'm sure someone will move this post for you soon, but in the meantime.....
Filling the box full of filler is a bad idea and extremely bad practice. The use of a masonry box, (I assume you mean a metal knockout box), is not rough when used in the circumstances you describe.
What I would probably do in your circumstances, mainly because this would be the easiest way, would be to remove the box and fit a new one so this sorts out your screw problem. Once you've done this, use filler\plaster to fill the wall around the box, (not in it), so you can tile right up to the edge of the box. The finish on this bit of plastering obviously doesn't have to be wonderful as you're tiling over it so as long as there's something there then that'll do.
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