Send all bugs to Aaron with a description what is wrong.
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For, in the final analysis, our most basic common link is that we all inhabit this small planet. We all breathe the same air. We all cherish our children's futures. And we are all mortal. - JFK
In the tile editor, all I do is hit F1 to paste an empty tile over the old before I load. Because I haven't copied a tile to that slot in memory (Ctrl+F1 to F8 to copy, F1 - F8 to paste!) it pastes an empty tile which effectively 'clears' the grid.