Disabling updates on OS X using /L/P/com.adobe. product .plist

Question

Having read in the Acrobat Deployment Guide that as of Acrobat 10.1.1, there's support for placing a FeatureLockdown-like key in a plist in /Library/Preferences. This is detailed on page 142-143:
http://helpx.adobe.com/content/dam/kb/en/837/cpsid_83709/attachments/Acrobat_Enterprise_Ad ministration.pdf
I'm specifically concentrating on Acrobat Pro X (10.1.1) in this case, and am testing on Snow Leopard 10.6.8. I've placed a plist at that path:
sh-3.2# defaults read /Library/Preferences/com.adobe.Acrobat.Pro      
    10 =     {
        FeatureLockdown =         {
            bUpdater = 0;
Or, if you want the full XML plist contents:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>10</key>
    <dict>
        <key>FeatureLockdown</key>
        <dict>
                  <key>bUpdater</key>
                  <false/>
        </dict>
    </dict>
</dict>
</plist>
It doesn't seem to take effect. I've tried restarting, logging in and out the user, convert to and from XML to binary plist format, nothing. I notice that Acrobat Pro X's updater plugin also knows something about a plist at /etc/defaults/AdobeARMOverrides.plist. Is this of any use?
Also, the proposed workaround at 15.6.3 is wrong:
"15.6.3  Preventing any updates
To disable the application’s ability to update altogether, use a post install script to move, rename, or
delete the Updater.acroplugin file from the <root>/Contents/Plug-ins/Updater.acropluginplug_ins
directory."
This should read "<root>/Contents/Built-in/Updater.acroplugin". I'm quite able to resort to this method instead, but I'd rather use the plist method so I don't need to remove the Updater with every minor update.

Answer 1

Sorry for the delay, was on vacation.
As is shown in my example, bUpdater is boolean. When else can you have "<false/>" as a key value? I've just verified in Xcode that it is in fact boolean.
The permissions were previously 644, owned by the 501 admin user. I've changed this to root:admin mode 755. No change.
I'm using Acrobat 10.1.1 on Snow Leopard Server.
On the subject of docs, they don't indicate anything about ownership/permissions, and are actually unclear about the contents of the file. It says to create a new "file" ending in .plist, and then to add the "entries" of the dict, without showing an example of the <plist> tag and the DTD. The next section (setting the Updater to manual) also states path "~/User/Library/Preferences/", which has ambiguous context and is also _not a real directory_.
Thanks,
-Tim