I was one of those who was having serious issues on VMware 6 running windows 7 and my cameras etc. so I spent 149 bucks upgrading to Fusion 7 pro hoping it would fix it. and sadly it DIDN'T.
But After that; I decided to try a re-install OSX. Because it worked last time I ran across this. (Mountain lion updated to Mavericks. and you guessed it...It worked. 
Step 1 : Shutdown your virtual OS
Step 2 : Close vmware
Step 3 : Download Yosemite OSX again.
Step 4 : Re-install Yosemite OSX (a clean install is NOT needed)
Step 5 : wait for install to complete......about 30 mins
Step 6 : login to Yosemite OSX
Step 7 : double click to open VMware 5,6, or 7
Step 8 : All should be working Flawlessly.
I found that for some reason if you install Yosemite before you update VMware it hangs.
so to fix just follow the 8 step To fix easy as 1-8 has been working flawlessly every since I've done that. Hope it does for you too.