here the test i do... VM 1 1- i create a win 7 VM with black background 2 -i do a snapshot name 01 VM 2 1 - i create another VM and link the existing hard drive from my previous VM to it 2 - boot on it and got the black background 3 - change the background to something else... 4 - snapshot 5 - shutdown VM 1 1 - boot on my VM1 Result ++++++++++++++ i got the background of my VM #2 Expected result ++++++++++++ have black background conclusion is that you actualy change the original HDD file while in session event if you snapshot. is there a way to make sure you don't modify the original HDD images ? thanks