Group Policy Rediect Problems

Hi

I have a domain which has now been extended via VPN to another office.

I have redirect setup at head office at the moment which seems to work fine.

I have now changed the policy to wokr by security groups and place members in appropriot groups.

The new office seems to have problems gettin the GP for redirects.

Gets everything else fine other then redirect.

the very strand thing is if i hammer on at it and keep doing a GPupdate /force it has sometimes worked for no reason at all.

Can some one help me work out were the problem is.