I did a factory reset recently as the phone was behaving weirdly. After the reset, some apps installed cannot be included in my folder.
I created a "games" folder for all my game apps, after switching on the phone, some apps will be gone from the folder. Not all apps will disappear, "angry birds" and some other apps seem vanish from the folder by itself. What is wrong with the phone? Thanks.
I've been suffering from the very same thing. Certain apps just vanish from the homescreen folders.
Tried creating another folder, change the name of the folder etc... nothing helps. Annoying bug!