Hi,
I use VirtualBox 4.3.4 and I installed Windows 7 64bit guest OS but when I used Chrome browser I noticed the browser does not refresh the page when I click a link or switch tab. For example when I switch to a new tab I still see the page of previous tab I was on.
I work around this by disabling "Use hardware acceleration when available". I dont know if other browsers has the same problem but I thought to report this anyway.