I notice suspending the guest OS if I'm going to be turning off the host ends up causing the VM to become nigh-on unresponsive upon restoring from suspension. It becomes locked and doesn't respond to any sort of input upon restoration. I have to do a force restart to get it back to normal.
Let me know if you need any specs or the like. I'll say right off I'm running Fusion 6.0.2 on OS X 10.9.