Odd problem we've had with a couple machines after the 5.5.1 update (don't know that it's an issue caused by the update, just started having the issue). We've had a few VMs report 'Partially Suspended' in the vCloud Director UI. When trying to do anything with the VM, vCenter reports " - Invalid virtual machine configuration.". Upon investigation, the VM's VMX file has been overwritten by a png. The png is a thumbnail/screenshot of some other VM.
Anyone see this before?