I have seen this problem as well, what type of laptop are you using?
This is not happening on our Dell's but is happening on some of the Lenovo laptops we have in one of our International offices (India).
We are using Endpoint Encryption 6.1 and have tried 6.1.1 as well and the problem still exists on the Lenovos only.
We are using Dell's.
So far, i've seen this on 2 Latitude 6410's.
Below are the steps to enable Hibernation Support
To enable hibernation support on an encrypted system create the following DWORD registry entry
and set it to a value of 5. The change will take effect on the next reboot.
This is the workaround provided by Mcafee it works on most of the Dell laptop models