I have checked what you have suggested and there is a major difference between V14 and V15 in this respect. Note that even in the simple case where I hit the Fetch Last Record button for a query that will return 10s of thousands of rows that the scroll bars don't work (or barely work) when the query is in process. This is with one connection to one session. Please help out here as I will have to roll back to V14 if this is not addressed.