i am having the same exact problem.  my master and media are windows 2003 sp2 
with NB 7.1.  i have three win 2003 sp2 clients x64 with different nb versions 
installed 7.1, 6.5.6, and 6.5.5.  they are all failing with the same problem.  
parent stream runs long and then eventually fails out.  i enabled the bpbfis 
log and found this at the bottom:

14:03:07.452 [5188.6052] <2> onlfi_vfms_logf: INF - snapshot services: 
emcsymfi:Wed Jun 22 2011 14:03:07.452000 <Thread id - 6052> Execption occured 
while closing handles
14:03:07.452 [5188.6052] <2> onlfi_vfms_logf: INF - snapshot services: 
emcsymfi:Wed Jun 22 2011 14:03:07.452000 <Thread id - 6052> execSymCLI : 
Command output
14:03:07.452 [5188.6052] <2> onlfi_vfms_logf: INF - snapshot services: 
emcsymfi:Wed Jun 22 2011 14:03:07.452000 <Thread id - 6052> Gate keeper is 
locked. Releasing the lock on the gate keeper.
14:03:07.452 [5188.6052] <2> onlfi_vfms_logf: INF - snapshot services: 
emcsymfi:Wed Jun 22 2011 14:03:07.452000 <Thread id - 6052> Failed to create 
child process

this just repeats over and over.  policy is a regular "windows" policy and not 
snapshot.  anybody ever experience this before?

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