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    <p>I had a similar problem in a very simple piece of code:</p> <pre><code> import sys, pygame pygame.init() size = width, height = 640, 480 speed = [2, 2] black = 0, 0, 0 screen = pygame.display.set_mode(size) ball = pygame.image.load("Golfball.png") ballrect = ball.get_rect() while 1: event = pygame.event.poll() if event.type == pygame.QUIT: pygame.quit() ballrect = ballrect.move(speed) if ballrect.left &lt; 0 or ballrect.right &gt; width: speed[0] = -speed[0] if ballrect.top &lt; 0 or ballrect.bottom &gt; height: speed[1] = -speed[1] screen.fill(black) screen.blit(ball, ballrect) pygame.display.flip() pygame.time.delay(5) </code></pre> <p>Error message was:</p> <pre><code> Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; File "bounce.py", line 22, in &lt;module&gt; screen.fill(black) pygame.error: display Surface quit </code></pre> <p>So I put</p> <pre><code> import pdb </code></pre> <p>at the top after</p> <pre><code> pygame.init() </code></pre> <p>and used</p> <pre><code> pdb.set_trace() </code></pre> <p><em>after</em> the line with</p> <pre><code> pygame.quit() </code></pre> <p>Now I ran the program, clicked to close the window and was actually a bit surprised to see that I fell into the debugger (after all, I expected the quit to completely take me out immediately). So I concluded that the <em>quit</em> doesn't actually stop everything at that point. Looked like the program was continuing beyond the quit, was reaching</p> <pre><code> screen.fill(black) </code></pre> <p>and this was causing the problem. So I added</p> <pre><code> break </code></pre> <p>after the</p> <pre><code> pygame.quit() </code></pre> <p>and all works happily now.</p> <p>[ Added later: It occurs to me now that</p> <pre><code> pygame.quit() </code></pre> <p>is quitting the <em>module</em>, and not the <em>program that is running</em>, so you need the <em>break</em> to get out of this simple program. ]</p> <p>Just for the record, this means the good version is</p> <pre><code> import sys, pygame pygame.init() size = width, height = 640, 480 speed = [2, 2] black = 0, 0, 0 screen = pygame.display.set_mode(size) ball = pygame.image.load("Golfball.png") ballrect = ball.get_rect() while 1: event = pygame.event.poll() if event.type == pygame.QUIT: pygame.quit() break ballrect = ballrect.move(speed) if ballrect.left &lt; 0 or ballrect.right &gt; width: speed[0] = -speed[0] if ballrect.top &lt; 0 or ballrect.bottom &gt; height: speed[1] = -speed[1] screen.fill(black) screen.blit(ball, ballrect) pygame.display.flip() pygame.time.delay(5) </code></pre>
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