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<p><font size="2">Rare but annoying when it happens.</font></p>
<p><font size="2">We are doing an Alice world where we are using events to control a seaplane. There is no need for anything but events, so for a change I immediately deleted 'my first method' from "when the world starts" and changed the event to "while the
world is running, during: seaplane move forward 1 meter. <br>
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<p><font size="2">Later in the exercise we added a speed control:</font></p>
<p><font size="2"> create a Seaplane properties variable called "speed"</font></p>
<p><font size="2"> replace the 1 meter in "seaplane move forward 1 meter" with "speed meters"<br>
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<p><font size="2"> choose two "when a key is pressed" 'A' and 'D' to "increment speed by 1" (Accelerate) and "decrement speed by 1" (Decelerate).
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<p><font size="2"> We needed a guard check to keep speed from going negative: "if speed > 0" decrement speed by 1<br>
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<p><font size="2">That's when I realized that the 'universal' commands at the bottom of the edit window, including the if/else had disappeared along with the edit window for the "my first method" I created a method long enough to get the if/else back then deleted
it again.</font></p>
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<p><font size="2">Bob Durtschi<br>
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