Update Netware 6.5 SP6 nightmare

3 Node Cluster Netware 6.5 SP2
Groupwise 6.5 SP3

one node updated to sp6, switch groupwise to this node
and we get the following error
error loading script....
load address space=dom.....
switching back to the nonupdated node - all works fine ???

is there any differences between Netware SP2 and SP6 with clustering
or should we update groupwise frist ?

Thanks for the help