Running Windows XP SP2 and Office 2003, Tab key in Excel has started to jump
multiple cells to right whenever I use it to navigate (instead of to the
immediate adjacent cell to right as designed). The number of jumped cells
seems random, and it is not to the end of a group of cells.
I find no help on this, after extensive searches. There seems to be no
place to reset the tab function.
All my other Excel functions seem to be working perfectly. I am very
experienced in Excel, and the loss of the tab function disrupts a
many-year-old habit.
"Enter" and Arrow keys still work as designed.

Thanks.

Dave