Creating a formula in a multi-sheet file

[Marlene]

When creating a formula and I can click to the tab I need
but when I click on the required cell on that sheet, I
can't select the cell. The portion of the worksheet that
is causing me problems is in a table but standard
formatting and no protection. I can click on a cell in
another portion of that same sheet and the formaula is
updated properly. But I return the the cells the table
portion the formula is not updated with the cell
reference.

I've several sheets in the file which exhibit this
behavior. SP2 and all updates have been applied.
ANY suggestions??? I'm stuck!

Thanks