Graphical Glitch - Outlook 2013 on a 2008 R2 Remote Desktop Server as a Remote App

Graphical Glitch - Outlook 2013 on a 2008 R2 Remote Desktop Server as a
Remote App

Server 2008 R2 SP1, with Remote Desktop Services.
Office 2013.
All Microsoft updates installed.
Publish Outlook as a RemoteApp, and run it from a Windows 8 client, then
open an email. What happens is this:

The email opens and renders briefly, but the Outlook inbox becomes
partly-visible through the email.
Most of the email is invisible, as if it was in the background, except the
border remains visible like an embossed imprint.
The partly-invisible email is actually in the foreground, the visible
Outlook main window is in the background.
Moving things around, clicking on them, causing a refresh, fixes the
display. Sometimes waiting does. It happens pretty much every email, but
not exactly every one.
Disabling hardware acceleration in the Outlook options doesn't make a
difference, nor does disabling add-ins, nor does changing the
LoadBehaviour in the add-in registry entries.
Using a full remote desktop session, Outlook works fine.
It happens on multiple Windows 8 clients, too. Not sure about Win 7.
Any ideas, please?