Kenneth Bull to SDL I noticed in trunk/SDL/src/video/win32/SDL_win32events.c, in this code here... ... if the device handle isn't found in mice[], which it won't be if the mouse was plugged in after SDL_Init, then you end up with an uninitialized value in index, which is then passed to various SDL_SendMouse* functions.

//
//  MyCustomView.h
//  SDL Custom View App
//
//  Created by Darrell Walisser on Fri Jul 18 2003.
//  Copyright (c) 2003 __MyCompanyName__. All rights reserved.
//

#import <AppKit/AppKit.h>


@interface MyCustomView : NSQuickDrawView
{
}

@end