LinuxQuestions.org - Fedora 20 Multiseat

Hello
I am trying to build multiseat system with Fedora 20 and Plugable DC-125. Most of the problems, connected with our custom built software are already resolved, but now we face hugh problem with custom built mono application.
The application uses windows forms and cannot be started from plugable devices. It works if started from the main station. Here is the error

Code:

exception inside UnhandledException handler: Object reference not set to an instance of an object



[ERROR] FATAL UNHANDLED EXCEPTION: System.ArgumentException: A null reference or invalid value was found [GDI+ status: InvalidParameter]

  at System.Drawing.GDIPlus.CheckStatus (Status status) [0x00000] in <filename unknown>:0 

  at System.Drawing.Bitmap..ctor (Int32 width, Int32 height, PixelFormat format) [0x00000] in <filename unknown>:0 

  at System.Drawing.Bitmap..ctor (System.Drawing.Image original, Int32 width, Int32 height) [0x00000] in <filename unknown>:0 

  at System.Drawing.Bitmap..ctor (System.Drawing.Image original, Size newSize) [0x00000] in <filename unknown>:0 

  at (wrapper remoting-invoke-with-check) System.Drawing.Bitmap:.ctor (System.Drawing.Image,System.Drawing.Size)

  at System.Windows.Forms.XplatUIX11.DefineCursor (System.Drawing.Bitmap bitmap, System.Drawing.Bitmap mask, Color cursor_pixel, Color mask_pixel, Int32 xHotSpot, Int32 yHotSpot) [0x00000] in <filename unknown>:0 

  at System.Windows.Forms.XplatUI.DefineCursor (System.Drawing.Bitmap bitmap, System.Drawing.Bitmap mask, Color cursor_pixel, Color mask_pixel, Int32 xHotSpot, Int32 yHotSpot) [0x00000] in <filename unknown>:0 

  at System.Windows.Forms.Cursor.CreateCursor (System.IO.Stream stream) [0x00000] in <filename unknown>:0 

  at System.Windows.Forms.Cursor..ctor (System.Type type, System.String resource) [0x00000] in <filename unknown>:0 

  at System.Windows.Forms.Cursors.get_SizeNWSE () [0x00000] in <filename unknown>:0 

  at System.Windows.Forms.SizeGrip..ctor (System.Windows.Forms.Control CapturedControl) [0x00000] in <filename unknown>:0 

  at (wrapper remoting-invoke-with-check) System.Windows.Forms.SizeGrip:.ctor (System.Windows.Forms.Control)

  at System.Windows.Forms.ScrollableControl.CreateScrollbars () [0x00000] in <filename unknown>:0 

  at System.Windows.Forms.ScrollableControl..ctor () [0x00000] in <filename unknown>:0 

  at System.Windows.Forms.ContainerControl..ctor () [0x00000] in <filename unknown>:0 

  at System.Windows.Forms.Form..ctor () [0x00000] in <filename unknown>:0 

  at MyApp.UI.Forms.AboutForm..ctor (Boolean aboutAction) [0x00000] in <filename unknown>:0 

  at (wrapper remoting-invoke-with-check) MyApp.UI.Forms.AboutForm:.ctor (bool)

  at MyApp.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0

In my opinion the problem is that the application doesn't know it has been launched from DISPLAY different than 0 and perhaps it is gdm issue.
If I connect remotely with ssh -X and launch the application, it runs and the DISPLAY is not 0, but when launched from plugable, it thinks it si from 0 (I think so).
I made launcher with setting the propper display before launch, but result is the same.
I tryed multiple windows forms libgdiplus applications (downloaded from internet) and result is the same. I tryed mono gtk-sharp applications and they work as expected.
The last thing I tryed was to run the application in Xephyr nested server and it works, but I have to make a lot of settings, so it is not acceptable decision for my needs.
Please, advice how to fix this issue or is there a way to some how virtualize this application and to run it other way.

Thank you in advance