That depends of how you configured your policy and if it was replicated to all DCs you have or not.
To check DCs health and AD replication status, you can use dcdiag
and repadmin commands. You can use dssite.msc to force the replication between DCs.
Please also reboot your computer and check again.
To map drives your GPP, refer to that:
If this is an XP system then you need to install the client side extensions:
More if you ask them in Group Policy forums:
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