have you guys tried enabling nested virtulization in your VM's while running the Emulator? I just tried it and had no issues at all once i enable nested Virtulization via the configuration menu although i didnt run it very long i was just testing for the crash to see if i could help. I let it run maybe 15 min. I use the mac version
First of all, thank you very much for testing VM and BS for us! It is a great news to hear for solution. Yet, I could not find out the button of nested virtualization in my VM and searched online for the problem. I find it seems that nested virtualization only supports win8 or above but I used win 7 for my VM. Is it true for this information? Do there any other way for enabling nested virtualization in win 7, or sort of other solutions replacing this option?
Second, I think I should give more details about my problem. I tried to disable the real time virtual disk optimization, and change the graphic memory from 1024 MB to 256 MB for better performance of VM. I noticed that BS did not run out of order if it is kept running at the backstage or not opening a game (after 15 minutes still ok). But when I started a game, after playing for around 5 - 10 minutes, it popped out a message box saying that the memory is running out, both parallels desktop and BS stopped and the screen "freezed" (I have tried for 3 to 5 times, ended up rebooting the MAC).
Then I started to change the setting of VM, I tried to disable the vertical synchronization (the button I found in Graphics but I don't know it is useful or not) and changed the 3D acceleration from Direct X10 to Direct X9 (disable this button will cause unsuccessful loading of BS / a long long loading) to see if it becomes better. The results were that the game ran longer (15 minutes more or less) but the message box still popped out when I continue to play (this time only the parallels desktop stopped, BS was still running...) I have not tried to enable the vertical synchronization and select Direct X9 together (rebooting for so many times is horrible

).
I did not know whether it is the problem of configuration of VM, or the problem of BS, or just because of the game (it is a RPG game that player can control the movement of the characters by touching and moving fingers on the screen). Before and after I change my laptop to MAC, I have used WIN version and MAC version of BS for the same game, they are totally alright (the only drawback is that MAC version of BS cannot use the key mapping).
It is great if you can give some suggestions to my situation; otherwise, I may need to give up using BS in VM. Thank you!