Had a customer call up with some major seamless application issues. These incuded white squares, inactive application windows, application windows off screen (to right of second monitor in dual monitor setup).

Environment: Server 2008 R2 RDSH, Windows XP SP3 and Windows 7 clients, vWorkspace 7.1.

If they ran the same seanless applications on a single monitor, everything worked properly.

The problem turned out to be due to a mix of RDP multi-monitor behaviour and vWorkspace multimonitor support. The client was set to "span multiple monitors when in full screen mode" (SpanMonitors=1 in config.xml) as well as "Display remote applications seamlessly on local desktop" (Seamless=1 in config.xml). From an RDP client viewpoint the desktop was one big monitor, but the vWorkspace client multi-monitor support saw the desktop as 2 monitors.

This resultant mess resulted from window adressing on 2 different virtual screen layouts and was truly weird.

Once SpanMonitors was set to zero (or untick "span multiple monitors when in full screen mode") the seamless applications behaved as expected.