Editing Excel File on Compatibility Mode

When using Excel 2007 under Compatibility Mode with Windows XP and Office 2003, there are certain things that I cannot do correctly.
It is when I cut, copy or paste any data into another spreadsheet, the picture mode will pop up and the data will lock.
If I open the data into 2007 and then cut, copy or paste, it become editable and can work again with the data.
How to resolve this?
