These are the vpxd logs in C:\ProgramData\VMware\VMware VirtualCenter\Logs (on a W2K8 box).
You can also consult them via the vSPhere client.
It's sometimes useful to set the messaging level to verbose if you're analysing problems
I'll get back to you after I have analysed the permissions and roles.
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Blog: LucD notes
Twitter: lucd22
Blog: lucd.info Twitter: @LucD22 Co-author PowerCLI Reference