cursor remains in openGL fullscreen

I have an openGL c++ windows class wrapper capable of switching display from fullscreen to windowed and back again based on user choice based on graphics capability. I have an intermittent glitch where the cursor hangs around in fullscreen display.

Things tried:

1. No wnd class cursor.
2. Used ShowCursor and tested return value to ensure ok
3. WM_SETCURSOR to explicitly set and kill cursor.

The odd thing is that it appears to work when you run the app once, but then the damned cursor appears (even when there isn't a wnd class cursor) in fullscreen display. Double-clicking on the window causes the cursor to disappear and re-enables keyboard input (tried SetForeGroundWindow, SetFocus - didn't help). The other odd thing i've noticed is that if I delay the application start with eg Sleep then the cursor disappears as it should; but then when I dynamically change the display mode the cursor re-appears at the new (fullscreen) settings!

Any and all suggestions would be very welcome. Thanks in advance.

im not sure why your having this problem, do you call ShowCursor() right after the switch or what?

In tests where I use ShowCursor, I use it to remove the cursor immediately after the call to ChangeDisplaySettings; i've also tried it out in different places without much difference in result. I also use it to re-establish the cursor when I return to default desktop/registry settings.

The thing I find bizarre about this is when I don't even have a wnd class cursor, don't use ShowCursor and still get the default 'arrow' cursor appearing in fullscreen display.

If you want to attach your code, maybe we'd be able to find your problem.
How are not having a wnd class cursor? If you're just using NULL it'll load the default cursor for you.

>>How are not having a wnd class cursor? If you're just using NULL it'll load the default cursor for you.<<

from msdn description for the hCursor param of WNDCLASSEX:

"If this member is NULL, an application must explicitly set the cursor shape whenever the mouse moves into the application's window."

ie NULL== no cursor, to explicitly set it you would have to handle the WM_SETCURSOR. This is what i'm finding as wierd, that when I have no class cursor, don't use ShowCursor and don't handle WM_SETCURSOR, the default arrow cursor still intermittently appears in the fullscreen display. I don't get a cursor appearing in windowed mode, as expected.

Sorry, but whenever I used NULL it uses the default system cursor. Oh well. Still if you want to post the code, I'll be glad to take a look at it.