Smart gwt grid grouping doesn't work when records are over 1000. Below 1000 grouping works fine. It's a multi-field grouping.
Any idea why's that happening?
Have you used method setGroupByMaxRecords(int groupByMaxRecords) on your grid? It's default value is 1000 so i belive that might be the cause of your problem. Try setting it for a number bigger than 1000, for example:
ListGrid.setGroupByMaxRecords(2500);