I have been able to VMotion from one ESX to another without issue..
My problem seems to be with one particular vm.
I get 90% into the vMotion then I get this error.
"A general system error occurred: failed tracking VMotion progress at destination (unknown exception)
any help is appreciated
Check the growth of your log files. You may have to clean up that /var/log folder. I had a similar problem and I found the log folder had reached is max allocated space and couldn't create any new log files
If the VM is on the new host 'registered' there, then use Dave's suggestion and report the bottom of the vmware.log.
If the VM is not registered on the new host, then something else occurred and you want to start looking at /var/log/vmware/hostd.log, /var/log/vmkernel for appropriate errors.