I need help.

I must have pressed a goofy function key by accident and got maya in some soofy mode that is ignoring snap to grid.

I can press either the hotkey OR the menu button to activate snap to grid. I select some vertices and I see the little circle indicating snap mode is active but when I move the vertices they just all slide left and right and do not snap!!!

I have tried everthing I can imagine but cannot get it out of this mode!!!

What's worse is it is somehow embedded in the preferences because quitting and restarting does not clear it. As long as this mode is on I am totally shanked up the cazoo and can't do anything!!!!