Managed preferences: computer prefs work; user prefs don't work on Lion clients.

Question

OK, so I'm running into a similar problem as before, but in reverse. On Snow Leopard clients, all of my MCX preferences work perfectly (computer and user). On Lion clients however, only computer/group preferences show up. User/group preferences are nowhere to be seen.
Server: OSX 10.6.8, OD (no AD)
Snow Leopard and Lion clients.
All clients bonded with server.
Most other services work.
Stuff I've tried:
Clearing/flushing MCX caches, unbonding/rebonding clients, restarting clients.
Deleting/recreating users and groups.
Restarting server.
Turning off all computer/group MCX preferences (so that only user preferences remained). No difference--accounts became unmanaged.
Goals:
Set Group sharepoint to automount for all users.
Set a Yearbook sharebpoint to automount for members of Yearbook group.
Set various preferences to Always Managed for students.

Answer 1

Lots of discoveries.
The problem isn't MCX preferences.
It was a combination of two things.
The preferences hierarchy was cancelling out some of the things I wanted to do.
The Lion clients weren't reacting nicely to my custom Group folder. I was following Wazza's Server Notes on creating a universal Group folder to share between user groups. The Snow Leopard clients were fine with this; the Lions weren.
Solution: It's a little bit of a hack, but I added my Groups folder to the Login as a simple AFP URL instead of ticking the "Add Group Share Point" box, and I did it from the computer groups instead of the user groups.
Bonus: Other MCX user settings are working now, and I'm a happy camper.