Excel 2003 :: Unprotected Cell Won't Allow Input On Protected Sheet

Using excel 2003, Workbook has several sheets, all sheets are protected workbook is not. I have my cells containing formulas locked, I have unlocked the other cells that require input of various data. When the user goes to type in a "unlocked" cell, (to over write the now obsolete data) it will not allow the user to delete the data, the curser remains a cross and the formula bar or the cell itself will now allow any changes.

I have double checked that the cells are unlocked. I can enter data after the last entry in the unlocked row and or column, but I want to be able to "cut or delete the data that is no longer need and begin entering data from the beginning cell of choice. I want to copy this "old" data to an archive sheet, but it will now allow me to select it.

Example: I have 6 columns starting, (a to f) the formulas are in columns e and f and start at row 4 These columns are locked and hidden. Columns a,b,c and d are unlocked for user input. All data is started from A5 which I want it to start from each time the old data is deleted and new data entered. If I place my curser on any of the cells in the e and f rows, the cursor remains a cross which is what I expect it to do, but columns a to d are doing the same thing, they are acting as if they are locked OR atleast those cells in the a to d areas which have existing data, as I can enter below.