[Inkscape-user] Snapping to Grid

Inkscape Users,

I'm having some trouble using the "snap to grid" feature. I checked "snap to grid" in the document options dialog, and set my grid spacing to 0.25 inch. My snap distance was set to 0.20. I played with some different snap distances, but I can't seem to get the nodes of any paths or shapes to snap to the grid. Any suggestions? Also, is there any way to specify the coordinates of a node?

Thanks,

Landon Blake