xpconnect broken after upgrading to xulrunner1928 from xulrunner1907

[sden...@rocketmail.com]

I have a system that leverages xulrunner1907 on Solaris 10 that works fine for using embedding xulrunner in a C++ application. XPConnect is used in javascript to access custom XPCOM C++ components. I load html files from "file://". I've worked through all the deployment issues dealing with:

preferences:
security.fileuri.strict_origin_policy = false
javascript file updates to allow xpcom access:
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");

But now we're porting to Linux and I'm upgrading to xulrunner1928 on RedHat Linux and I'm getting script denial errors:
script from file:// was denied UniversalXPConnect privileges

Any ideas of where to start looking? I can see xpconnect/chrome.manifest changes with gecko2.0, but I don't think I should have to do those upgrades since I'm still working with xulrunner 1.9.2.8.

[sden...@rocketmail.com]

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Also, I do also have the system preferences set to enable UniversalXPConnect:
pref("capability.principal.codebase.p0.granted",
"UniversalXPConnect");
pref("capability.principal.codebase.p0.id", "file://");