I just tested this. It seems to be working fine. I have a list of equipment categories. These are showing up in a window (page), Equipment Maintenance, via a list converter. The list has five items in it. If I go to the window that I use to add/edit categories and add one; then, go back to the other window, I now have six items in the list. The new one shows up.
I did try this out on grids earlier last week. The data refreshes nicely on them, too.
I did not do anything special (that I can think of) in order to get that functionality. Not sure where to point you on this one.