Hi,
When running VMware fusion in full screen mode (2560x1600 on an external monitor) and hitting the CMD key, the UI for the guest OS freezes. I have to shut down the VM and bring it back up in order to regain control. When it's in the frozen state, I confirmed that the VM was still alive and receiving input by making blind modifications to an open file before shutting down. This is pretty painful as it means I can't use fullscreen mode and CMD+tab to switch between programs. I should note that I don't ever recall this kind of UI freezing happening in OS X 10.9 and VMware Fusion 6
VMware version: VMware Fusion Professional Version 7.1.1 (2498930)
Guest OS version: Ubuntu 14.04 LTS
Host OS version: OS X Yosemite 10.10.1
Host Hardware: Late 2013 16" MBP Retina with 16 GB RAM and i7 processor