Filevault and Launch Services

I am having the same problem that so many people reported with Mac OS 10.5: every time I log out, the Launch Services plist is erased. I shouldn't say "every time" since I can't be sure, but it just happened the last three times I logged out. I use FileVault + Time Machine, which are associated with this bug in OS 10.5 (see https://discussions.apple.com/thread/1236250?start=0&tstart=0).

For instance, I just did a back up by logging out and logging back in, and (after Firefox complained that it was no longer the default app for web browsing), the file ~/Library/Preferences/com.apple.LaunchServices.plist looks like:

{

LSHandlers = (

{

LSHandlerRoleAll = "org.mozilla.firefox";

LSHandlerURLScheme = http;

},

{

LSHandlerRoleAll = "org.mozilla.firefox";

LSHandlerURLScheme = https;

},

{

LSHandlerRoleAll = "org.mozilla.firefox";

LSHandlerURLScheme = ftp;

},

{

LSHandlerContentType = "public.html";

LSHandlerRoleAll = "org.mozilla.firefox";

}

);

}

and it has a create date of a few minutes ago (the time of logging in).

Any guesses about how I might fix this? One solution (which I haven't yet tried) is to make a global launch services, see http://hints.macworld.com/article.php?story=20091112095601678. This was a suggestion for 10.5.

A