If I run a test code like the following I experience a window freeze (the 
close button not working anymore). The application displays the current fps 
for some time and if I, for example, click on the window I experience a 
freeze. 

- The problem is reproduced also on a larger scale with a complex 
application (ie this is not related to the fps display thing). 
- The problem seems to be solved (there is a performance drop) if at the 
end of the on_draw method I put a pyglet.gl.glFinish() call or, I schedule 
some call that sleeps for some time.
- It happens only on a system (Ubuntu) with a [GeForce GTX 550 Ti] (rev 
a1), using the nvidia driver version 304.51

Am I doing something wrong? This is a known bug?

--------------------
import pyglet

w = pyglet.window.Window()
ds = pyglet.clock.ClockDisplay()
@w.event
def on_draw():
    w.clear()
    ds.draw()
    
pyglet.app.run()
--------------------

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