Subcategories not showing

I have your plug in for about a year now. It was working find but with the new upgrade, I can see the old slider and when I want to create a new one on “Choose category(s)” only show the main categories not all of them.
The problem is that when I create a slider it doesn′t show the child categories and I am marking under “Display child/subcategories” Beside parrent.
Can you please let me know where is the problem?
TIA
Inma