I have a treeview control inside an userform in excel. It works parfectly in my PC, but in other PC (excel 2010 both) it doesn't load. When I call the userform I receive an error message #424 in runtime (object is required) and when I check for the control in the userform it isn't there anymore. I can redraw the missing treeview control and then it works, but this is not an optimal solution (redraw it in other computers everytime I modify the original excel file in my computer). Have you any ideas of what's going on?