I've been happily using Myvmk Experience for a few weeks now.
I've noticed it doesn't always release resources, and my mac starts running slowly in general. A plain old restart doesn't fix the problem, so I:
1) Reset the System mgmt controller by shutting down, then press left side shift and control and power button at the same time and release all.
2) Reset the PRAM by shutting down, pushing the power button and quickly press and hold the Command-Option-P-R keys. (You must press before the gray screen appears.) Keep holding them down until you hear the startup chime for a second time. Release the keys.
3) Do a scan/semi defrag by shutting down, then push the power button, once you hear the startup sound push the shift key, let go the shift key when you see the grey Apple icon and the spinning gear.
Hope someone finds this useful.