I have found myself not liking the default grid snapping behavior of recent Inkscape builds. When you have objects with a stroke, the stroke isn’t considered in the snapping, so for a 1px stroke, you’d get exactly the opposite what you might need. Inkscape would snap to the middle of the stroke, leaving your outline fuzzy.
The reason for this is the that node snapping is enabled. What you need is object bounding box snapping. Good bye fuzziness.