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I have a drawing (http://goo.gl/CVtdH) where I have put a some boxes and lines 25 cm from the top of the canvas but even though they should be on exactly the same distance from the top, these objects visual distance from the top varies a few pixels, hence they are not in line. Why?? How do I adjust/correct that?

Furthermore, the line that is coloured red - I can only move its left end. If I use the select tool (arrow) and drag in the middle of this line it just rotates. Can someone explain why this happens?