I have answered my own question already, but thought I would post this in case others find it useful.
My trusted location page contains this path:
\\nfswkgrp\nfswkgrp\pcamain\Access2007Conversion\2007DBs\
I have checked the "Allow trusted locations on my network" box.
I open this database:
On my network, I have \\workgroups\myworkgroups mapped to M: drive.
I open database
M:\mywkgp\Access2007Conversion\2007DBs\FPMDataEntry2007.accdb
And I still get the "Security Warning: Certain Content has been disabled" message every time I open it.
But if I set up my shortcut to open using the whole \\workgroups\myworkgroups\mywkgp\Access2007Conversion\2007DBs\FPMDataEntry2007.accdb, it works as expected, with no security warning.
Also, using the trust center I browsed to m:\mywkgrp etc and tried to add the trusted location that way, but when I do the trust center stores a whole big long path starting with mycompanyname.com\global\namerica\mytown\workgroups\myworkgroup etc.
and then I need to include that whole string in my shortcut in order to avoid the security warning.
So the moral is: You must use EXACTLY the same FORMAT of the path in your shortcut as is stored in the trust center.
My trusted location page contains this path:
\\nfswkgrp\nfswkgrp\pcamain\Access2007Conversion\2007DBs\
I have checked the "Allow trusted locations on my network" box.
I open this database:
On my network, I have \\workgroups\myworkgroups mapped to M: drive.
I open database
M:\mywkgp\Access2007Conversion\2007DBs\FPMDataEntry2007.accdb
And I still get the "Security Warning: Certain Content has been disabled" message every time I open it.
But if I set up my shortcut to open using the whole \\workgroups\myworkgroups\mywkgp\Access2007Conversion\2007DBs\FPMDataEntry2007.accdb, it works as expected, with no security warning.
Also, using the trust center I browsed to m:\mywkgrp etc and tried to add the trusted location that way, but when I do the trust center stores a whole big long path starting with mycompanyname.com\global\namerica\mytown\workgroups\myworkgroup etc.
and then I need to include that whole string in my shortcut in order to avoid the security warning.
So the moral is: You must use EXACTLY the same FORMAT of the path in your shortcut as is stored in the trust center.