Performance Manager returning no data - C#, vSphere 6.5

Hi all,

I have code that works fine with vSphere 5, 5.5 and 6.0 that will return me performance stats with no problem. As soon as I point it at a 6.5 environment I get nothing returned by any object for any counter.

I have used powershell to query the 6.5 vCenter (not an appliance) and it returns data correctly.

Is there any changes that I have missed for 6.5 which could stop me getting performance data from vCenter? It is hard for me to post code as it is entwined with some complex methods etc.

Thanks,

Paul