Q) The PVP.net Client it's fully black, so the bot stuck.
Spoiler
Sometimes weird stuff happens with the Vms and the Game, my solution usually for this problem it's do reclone the vm that does this. But I've heard if you delete some folders and let the game download again it also should fix since the problem could be corrupted files.
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Q) My VM it's complety BLACK! I don't see nothing but it's still running.
Spoiler
Well this is a good signal that your GPU crashed on the Host PC. This happens mainly when the GPU Video Memory hits the limits and specially on Nvidia GPU cards.
We must understand that each VM we run it's more video memory being used, and each patch that is coming the game it's getting more GFX and using more video memory so this problem starts to happen to lot of people even with only 18 vms.
To check the video memory in use you can use this tool:
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If you go to the event viewer of the PC host you should find some event that relates to the GPU crashing and recover, you can even set a trigger on the Event Viewer in case of this send you an email, since when this happens you have to restart all vms, or do your own script that on this event stop and restart all vms
Nevertheless a good solution to save some video memory and your GPU, it's to run the game in background. just start all vms then you click to close the workstation and choose run in background.
I've heard this problem for lot of people that uses nvidia GT 640/630 2GB versions or similar. I think with ATI the GPU handles better at least since i use gaming ATI versions even with 2GB they can handle the 18 vms.