Excel 2007 Quick Access Tool Bar Problem with Macros

Hi there.
I have 3 different files, each one of them has macros and I use buttons in the Quick Access Tool Bar to run the macros.
When I have more than two of these files open and I run any of the macro that opens or closes one of the other files, the buttons in the QAT are duplicated. How can I avoid this behavior, is there any way to lock the QAT so it doesn’t get modified? It is important to mention that I have no problem with the macros... they run OK without any errors, but I don’t understand why the appearance of the QAT changes.
One more thing. When I run the macro step by step with the Debugger nothing changes in the QAT and everything goes fine.
I appreciate any information about this subject.

Hi,
when You use exactly the same macro in different workbooks and You are the only one person handling this macro, why do You maintain this macro in all the workbooks?
Possible solution will be to move the macro to personal.xlsb file, and link QAT to macro in this file...

M