Comment 25 for bug 988251

[EDIT PLEASE DELETE MY ABOVE TEXT] After experiencing this problem for a long time I NOW CONCLUDE that this has to do WITH THE THUMBNAILS STILL LOADING or THE CONTENT OF A FOLDER STILL LOADING (as long as this folder is opened, eg in a new tab). As long as the thumbnails have not been fully created (or the content not listed in Nautilus?) IN THE JUST OPENED SUBFODLER, you will get the (partly) greyed-out right-click content menu. If its already done loading, no such bug.
This might be a useful thought for fixing this bug so I thought I might share with you. Peace out!