I haven't migrated to Excel 2007 yet, so I can't test this.
But can you tell us more?
If cell A1 holds 1 (automatically assumed as +1), and cell A2 holds the same, what happens if you activate cell A3, mouse click cell A1, press the - (minus key) on the keyboard, then mouse click cell A2?
Does that work, or if not, what happens?
If i have +1 in one cell and +1 in another cell,
and i want to minus one cell from another, then the only way it will work is if i use IMSUB
Only a problem with MINUS sums... wierd... any help GREATLY appreciated.