I've been having a similar problem since I upgraded to 10.8.3 and 5.0.3.
I'm running mac and windows 7 and almost every time I switch views between them, I get a freeze that lasts for about 5 seconds then it comes back again.
I'm using a same windows image as before and nothing really changed since the OS and fusion upgrades.
This is just extremely annoying and it seems Parrallels 8 is not showing the issue at all...
Hopefully vmware can come up with something soon and I won't have to switch to Parrallels,
Brian,
