Okay, this is weird. I have a workbook that has been in use at least two years. The workbook has several worksheets, some of which have about 2,500 rows. On all worksheets except one, I can use the vertical scroll bar to move slowly down the rows. But only on one worksheet, moving the vertical scroll bar just a little bit immediately causes the worksheet to jump some 3,000 rows which is way past the last row that has any text. In other words, on this one worksheet, I cannot use the vertical scroll bar to move down the rows. Why does this happen? What could I have done to cause this strange behavior?