Digital Sig not working
 

I have created a digital signature using makecert.exe. I have then created
macros and signed them. All works OK so far.

A collegue has had their machine updated. What updates, i dont know - among
other things, probably all the latest updates and SPs.

Now, only on THEIR machine, my macros are disabled unless i set to low
security (which is not an option). Even on Medium, there are no message boxes
asking to enable/disable. Previously I checked the 'always trust this source'
but I dont get anything.

Anyone able to ched any light on it ??

Thanks in advance.