When testing some systems in a lab environment, I've noticed that after the VM was paused and restarted, the OS is happy with the new time of day, but the ns_server erl VM is stuck in the past. Negative effects of this are the log showing the wrong date and time and the graphs in the UI not working.
This would seem to indicate any drift fixed at the OS level isn't making it's way into erl. This is particularly bad for things that are paused/restarted, but could also affect those that just naturally drift or drift due to virtualization.
Note: this hasn't actually been observed against 2.0 Alpha, but it's presumed to be there as well. Filed there so it doesn't get lost in the shift from 1.7 to 2.0.