vpxd high cpu usage

Hi,

We have a 1000~ vm's infrastracture and recently we upgraded to vcenter 5.5 update, some of the hosts are 5.5U1 also and some are still 5.1.

After the upgrade we began to experience constant 100% CPU usage by the vpxd.exe proccess.

vpxd.log shows this only line repeatedly :

<Time> "info 'commonvpxLro" opID=<various id's> [VpxLRO] -- BEGIN\FINISH task-internal <various numbers> -- -- vmodl.query.PropertyCollector.retriveContents -- <various UUID> (<another UUDI>)

It's just flouded with these a few times a second.

Any one has any idea what can cause this type of behavior?

Thanks,

Chen.