User opens a session with a Windows 7 VDA Sometimes performance issues appears moving Windows. User clicks on screen, but application is not redraw till user resize the window.

+ Disable DirectDraw and Direct3D acceleration
http://superuser.com/questions/495303/how-do-i-disable-directdraw-and-direct3d-acceleration-on-windows-8
1. Disable Aero(Mostly not necessary but do it for now).
2. Download directx 9.0c control panel.
3. Extract and run "directx.cpl" as administrator.
4. Goto Direct3D and DirectDraw tabs and uncheck "Allow hardware acceleration ".

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Problem Cause

Issue related with DirectX hardware acceleration as it is a web-application using java.

User opens a session with a Windows 7 VDA Sometimes performance issues appears moving Windows. User clciks on screen, bur application is nor redraw till user resize the window