'Snap during transform' not doing anything I've encountered a strange problem with the snap during transform setting, where it seems to be being ignored.

I've tried toggling it on/off, using the different snap modes (to vertex, edge, face, etc), snap targets, but the behavior that I previously had (being able to drag a vertex towards another and have it snap) seems to have been lost somehow.

I'm assuming I accidentally hit a key combo that changed something but I'm fairly new to blender so I'm not sure what that would be. 

Hitting Ctrl seems to move the vertex some units in a direction, but doesn't actually snap it to the nearby vertex.

Here's a quick image of what I'm experiencing:


I should mention that snapping to grid seems to work fine - all other snapping methods do not.
The reason why it does not seem to work is that the mouse cursor is not hovering exactly over the vertex which is to snap.




Enable Snap during transform by clicking on the red Magnet symbol or by pressing Shift + Tab.
Choose Vertex as Snap Element
Enable Snap onto itself 

 

*If Snap during transform is disabled you can hold down Ctrl during Translation (G).*





Hover the Mouse cursor over the desired Vertex

Make sure you hover exactly over the Vertex otherwise it won't snap


A little circle will appear on the Vertex 




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Another possibility to achieve the desired result is to Merge the Vertices


Select the two Vertice by holding down Shift and click RMB
Press W and choose Merge
Choose 'Merge at Last' or 'Merge at First' depending on the selection order