Related to bug 48560?
IP editor reports that when he removed categories from this category https://it.wikipedia.org/w/index.php?title=Categoria%3AMarketing&diff=65461531&oldid=60402800 , all he could see after he saved was the category description.
The category tree and the list of the categories at the bottom only appeared after refreshing the page.
His setup: Firefox 28.0 , Vector, Windows 7
I reproduce the same issue with that setup in this edit: https://it.wikipedia.org/w/index.php?title=Categoria%3AVisualEditor&diff=65497855&oldid=64118006 .