I just received a workbook, and on the first sheet I can press Ctl page down
and navigate to the next worksheet. However, on all the other sheets, this
same action (or Ctl page up) does not change sheets, but shifts me left or
right, like I had clicked on the horizontal scroll bar.

I have examined all the settings in Tools, Options (using excel 2003), but
do not see anything different between the sheets. New sheets act normal - I
can shift from one new sheet to the other via key strokes.

The sheets which do not work normal have had their sheet tabs colored and
contain () in the names as they are copied sheets. Removing the color and
renaming does not solve.

Copying to a new workbook does not solve.

There are no hidden or very hidden sheets in the workbook.

The workbook and sheets are not protected.

There are no macros in the workbook

Any ideas?

Bob