For anyone else that might hit this thread. After upgrading from Kernel 2.6.22-14 to 2.6.22-15 the symptoms I saw were:
Trying to start or restore a virtual machine gave the error:
Trying to reinstall vmware-server gave:
Unable to change virtual machine power state:
The process exited with an error: End of error message.
In the details:
subprocess post-installation script returned error exit status 1
Starting VMware services:
Virtual machine monitor failed
Virtual ethernet failed
Module vmnet is not loaded. Please verify that it is loaded before
running this script.