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ya i just recreated the situation i was in either fullscreen and/or coherence mode and i reset the VM made mouse issues then in coherence mode i...
well not sure which part fixed it but i went to coherence mode then enabled the usb receiver on the VM menu at top right screen then disabled it...
same here using windows 8 and just disappears every time i click on the virtual machine and then it tells me to press control alt to reclaim...