Hi Tim,
My guess is the <Alt> key because it doubles as a windows accelerator
function.  I've had similar problems where the behavior seems to get "stuck"
when I'm using <Alt> in combination with the arrow keys or <PgUp/PgDown>.
However, in my scenario, the scene keeps moving, just doesn't accept keyboard
input anymore.  What do you mean by "locks up"?.
Hope this helps,
-guillermo

Tim Bray wrote:

> Hi - I've a large (800x600m) but reasonably simple scene with a
> KeyNavigatorBehavior hooked up in the default way (holy cow, the frame-rate
> is high, it's like hurtling around in an Indy car) - anyhow, the symptom
> is that it just locks up from time to time - this on a perfectly
> standard Dell box running NT4.  Sometimes hitting the ESC key unjams it,
> sometimes I have to restart the app.
>
> Are some well-known gotchas to watch out for? -Tim
>
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