If your cursor seems to disappear when over a white space in the VDI.  You can resolve this by either resizing the window so its not in "Full screen" or by changing to to a black cursor.  This is an issue between Horizon Client and Windows and not an issue with your equipment.

1. In the VDI click the Windows/Start button.
2. Type 'Mouse Colour'.
3. Click 'Change mouse pointer colour' when displayed.
4. Choose the black mouse cursor.