Upgrading Citrix Receiver from version 3.1 to 3.2 prevents Windows Aero in XenDesktop to work

Environment: Citrix Receiver 3.1, Citrix XenDesktop 5.6.

Problem description: if you install the new Receiver 3.2 as an upgrade of Receiver 3.1 your Windows Aero themes in XenDesktop will not work anymore.

Problem cause: after the upgrade the vd3dn.dll file is missing from the ICA Client directory.

Problem resolution: to solve the issue uninstall Receiver 3.1 before installing Receiver 3.2; do not perform an upgrade.