Snap to will not turn off

For some reason 'snap to' will not turn off.  I've done the obvious by clicking the snap to drop down and checking them on and off, and by going to snap to in the 'View' drop down.  Everything shows that all are turned off, all are acting as turned on.  I haven't changed anything, at least to my knowledge.  It simply started a few weeks ago and is driving me mad.  Hopefully someone out there knows how to fix this.  I'm betting it's something simple.  I watched a video that showed going to set up in the view drop down to make changes, but I have to set up option under the view tab.  Thank you for your help!