Photo Not added to Quick Collection when Marker Clicked

Recently I have not been able to add photos to a quick collection when the marker is clicked. The marker fills in, but the photo does not appear in the quick collection. At the same time this problem occured, I could not remove photos from the quick collection that had been previously added. I had to remove those photos using the menu system. I upgraded to the new release of Lightroom 5 yesterday thinking that would solve the problem. I still have the problem so I am wondering if it is a setting I have missed. The quick collection marker button is checked in the view options and the button does appear and change when clicked... The photo thumbnail is just not added to the quick collection.