After a re-install of BlackBerry desktop, I noticed that each time I sync'd there would be an automatic device application check and update. So each time I stabilized a version, a new one would sneak in and my settings would no longer be as expected.
Finally, this is what works (2/27/2010):
You will need to remove the Blackberry Desktop Application (sorry, you really do... #fail by Blackberry) and re-install it (simply modifying the program will not work - more on that later), being careful to do these two things during the install:
1- Click the icon next to "BlackBerry Automatic Update" and change it to "This feature will not be available."
2- Later on in the installation, un-check "Check for software updates."
This article explains why (has to do with temporary files unavailable if you simply try to modify the program):
(The info in this next link did not work for me, but saving for reference:http://www.blackberryforums.com/general-blackberry-discussion/159789-why-wont-my-os-update-i-deleted-vendor-xml-file.html)
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