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When I use Firefox on the Windows VM’s for a few minutes and then I switch back to the Host and tried to use Firefox it won’t let me type anything on the browser I can paste to the search bar and search like that but that is it. I believe that is a conflict with the browser on the VM machine the weird part is that Firefox on the VM’s never have this issue!! This is been happening for about 3 months now at first this only happened once I a while but know it happens every time I use Firefox on the VM’s it leaves Firefox on the host unusable until I reboot my host!! I tried uninstalling Firefox and reinstalling it but that didn’t fix the issue the only way to get Firefox to work on the host is by rebooting the Host machine.
I hope someone can give me some insight on this issue because it’s very annoying
Thanks.

Windows 8 is my Host and i'm running Wins 7 and 8 as Guest.

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Out of my head, I would guess the guest is still capturing your keyboard, even tho it shouldn't with Windows - the release should be automatic. Could you press the host key (usually your right Ctrl key) before switching back to the host and try again?

usually your right Ctrl
That did the Trick I just never use it because it always has release the keyboard automatically!
Thank You!