Enable Macros window does not pop up. Security Medium

[miguel]

Hi everyone, A few times when I open an excel workbook that contains
macros the "Enable/Diasable macros" window does not pop up even that I
have the macros security on Medium. I want that window to pop up
always.
Some information:
My workbook is in a newtwork drive in a windows network.
I think for the whole network the macros security is set up in "Medium"
because every time I change the security of the Macro ( to high or
low), the next time I open the macro security option, It is always on
"Medium".

Any suggestion will be appreciated.

Miguel