Could you share if both the PC configurations are identical, or at least their video cards are the same? And if so, can you please give me some more details about them? Here, I must note it could be better if we continue this discussion in a private support ticket in order to prevent any sensitive data leaks. So, I recommend you opening one on the matter.
Until we investigate what is causing the issue on your side, you should be able to use the simulator in the AppBuilder In-browser client
. It has the same functionality as the other simulators between our clients.
I hope this helps and I am looking forward to your reply.