Hi, Marcia,
Fortunately, I met the same problem as you described. And the other user just yourself. I thought that's because of the property allowaddnew. In fact, it will add the new record in the very beginning while you enter to a new row. but after you do some modification on this new record the problem happend, sometime even you did nothing to the record. I take it as a bug of the grid. So the use a makeshift solution, just set the AllowAddNew property to false. And while user in the the last column of last row(maybe not last row) in the grid, he or she could press a hot key to insert a new row. Like press CTRL_ENTER or CTRL_INSERT key to inform the program. I have no enough konledge to check out the bug is surely about the allowAddNew property of grid object or not. Maybe here someone else could make it out. I hope my solution also helpful to you. Also I will thanks all the persons here have given the help to me.