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When disabling the mouse cursor and left clicking on an exclusive full screen SDL app, mouse click coordinates don't register correctly.  If I enable the mouse pointer and left click, things report fine.  If I disable the mouse pointer but change to windowed mode - all works fine.  But if I disable the mouse pointer AND go to fullscreen mode a wierd thing happens.  The origin of the coordinate system (normally 0,0 is at the upper left most corner of the screen) seems to get shifted to the center of the screen. So any click in the upper left of the screen all report as 0,0.  At the bottom of this bug report description is a toy but functional C++ code that demonstrate th eproblem. It saves moue click coordinates to stdout.txt.  I cycle between enabling and disabling the mouse pointer in the code so that one can see where the pointer is being clicked at (the mouse pointer flashes). The same problem occurs when one does this as well as just disabling it all together. Lower case 'q' ends the program.

 This code originally was for a touchscreen (hence the mouse pointer disabled). I tried it both on the touchscreen machine AND another machine that has never been hooked up to a touchscreen (to eliminate the chance to the touchscreen driver causing the problem. This second box never has had the driver installed on it).

 This is compiled via MinGW 5.0.3
---------------------
#include <iostream.h>
#include <stdio.h>
#include <SDL.h>

char* renderText(int, int, SDL_Surface*, char*);

int main(int argc, char *argv[])
{
	SDL_Surface *screen = NULL;
	SDL_Event event;
	int quit = 0;
	char buffer[100];

    cout << "Initializing SDL.\n";

    
    /* Initialize defaults */
    if((SDL_Init(SDL_INIT_VIDEO) < 0)) 
    { 
        cout << "Could not initialize SDL:" << SDL_GetError();
        return 1;
    }

    cout << "SDL initialized.\n";

    /* Clean up on exit */
    atexit(SDL_Quit);

    /*
     * Initialize the display to the desktop resolution (0,0 for
     * first two parms to SDL_SetVideoMode), requesting a software surface
     */
    screen = SDL_SetVideoMode(0, 0, 0, SDL_SWSURFACE|SDL_ANYFORMAT|SDL_FULLSCREEN);
   
    if (screen == NULL) 
    {
      cout << "Couldn't set video mode: " << SDL_GetError();
      return 1;
    }

    
    sprintf(buffer, "Screen set to resolution %d, %d\n", screen->w, screen->h);
    cout << buffer;
    
        while (quit == 0)
        {
    SDL_ShowCursor(SDL_ENABLE);

// hide the mouse pointer
    SDL_ShowCursor(SDL_DISABLE);

//Event Processing
    	  while( SDL_PollEvent(&event))
    	  {        
             	  switch(event.type)
    		      {
    		      case SDL_KEYDOWN:
    			    cout << SDL_GetKeyName(event.key.keysym.sym) << " key down is pressed\n";
    			    break;
    		      case SDL_KEYUP:
    			    cout << SDL_GetKeyName(event.key.keysym.sym) << " key up is pressed\n";
                    if (strcmp(SDL_GetKeyName(event.key.keysym.sym), "q") == 0)
                      quit = 1;
    			    break;
    			  case SDL_QUIT:
    			    quit = 1;
    			    break;
    			  case SDL_MOUSEBUTTONDOWN:
    			    if( event.button.button == SDL_BUTTON_LEFT)
    			    {
    			      cout << "mouse click at " << event.button.x << ", " << event.button.y << "\n";
    			    }
    	          
       			    break;
    		       } // switch 
        } // while EVENT Processing loop
      } // while quit = 0
        
    return 0;		
}