I have a dual-screen set-up with a Windows host and a Linux virtual machine.
Windows Host: Windows 7 x64, VMware Workstation (8.0.5, most recent) Linux VM: CentOS 6.4 x64 (most recent) + VMware Tools (most recent)
The shared clipboard feature is of great importance to me. I often copy commands from the Windows host into the Linux VM, but clipboard sharing often stops working.
A reboot of the guest does not solve the issue. A reboot of the Windows host machine does solve the issue, although it's only a temporary measure. The issue often comes back within 20-30 minutes after reboot.