When launching a seamless application the application opens in a black window and you are unable to see anything in the window.
This has been identified as a product defect that affects connections when the primary monitor is located on the right.
The primary #1 monitor must be the far left monitor (on a single line monitor display), or the top left monitor in a 4 (square) multimonitor setup.
EG    
This is currently a design limitation / requirement within vWorkspace.