Have actually only used this once now, as we just recently purchased it.  Worked as it should and we are satisfied so far.  I am curious, however, as to why there is a hole in the glass lid.  We have had several slow cookers over the years and have never had one with a hole in the lid.....and there are no pictures on your website that show a hole in the lid.  Did I get a defective lid?  Please advise.