ZCM 10.0.2

I have a group policy assigned to all of the student users (actually associated with the OU in edirectory)

Anyway the policy is working a a couple of machines and not others. I updated the policy and incremented the version a couple of days ago, thinking that might fix it after a refresh, but still no luck.

On some workstations under the polices portion of the agent there is no group policy shown, sometimes the old version is shown etc..

What can I do to make the group policy work every time a student logs into any workstation, and make sure that it uses the current version?

Oh... I don't know if it matters but the student accounts are also volatile DLU Power users.