I'm running my existing Windows 7 x64 BootCamp partition in Fusion (not as a VM), and after upgrading from Fusion 4.1.4 to 5.0.2, when I switch from full screen to single window, the resize handle lines at the bottom right of the window disappear. They reappear if I click in the window and move mouse cursor over bottom right of window (ie. the right of the taskbar).
In case it matters, I'm running Snow Leopard 10.6.8, have a double height taskbar and resolution is 1920x1200.
It's a minor issue, but didn't occur with Fusion 4.1.4.