No error is thrown, and moving the scroll-bar again forces the grid to redraw normally. It seems to be more common in larger data sets which take longer to load.
Since the issue is sporadic and sometimes hard to duplicate I have attached a video(see below).
It may be helpful to note that the load mask is typically removed before the rows are drawn. However, you will notice in the video that before the problem occurs, the rows are actually drawn behind the load mask, then are gone when the load mask is removed.
From the console I called .refresh() on the grid's view, but nothing changed.
Let me know if you have any questions or if more information is needed.
*EDIT BY SLEMMON
I could not reproduce the issue on IE10, FF (Mac or PC), or Chrome using the linked example above, but see the issue demonstrated in the linked video
*EDIT BY FOXMULDER900
Yea, I realize it can be pretty difficult to reproduce, sometimes it takes a few minutes of playing around before it occurs. The key seems to be to stop scrolling as soon as you see the rows rendered behind the loading mask.
Last edited by FoxMulder900; 10 Jun 2013 at 10:28 AM.
Reason: Additional test case info