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10.1.3 ReceiveNextEvent gets '\0' for rawKeyDown

The following code on 10.1.3 always gets ch == '\0' for any key I press:

// got here from an application-level command event handler invoked from my RAEL loop

const EventTypeSpec spec[] = {{ kEventClassKeyboard, kEventRawKeyDown }};
EventRef event;
char ch;
verify_noerr( ReceiveNextEvent( 1, spec, kEventDurationForever, true, &event ));
verify_noerr( GetEventParameter( event, kEventParamKeyMacCharCodes, typeChar, NULL,
sizeof(char), NULL, &ch ));
// ch == '\0'... but we'll try another way...

EventRecord eventRec;
verify( ConvertEventRefToEventRecord( event, &eventRec ));
ch = (char) (eventRec.message & charCodeMask);
// ch still == '\0'

ReleaseEvent (event);

This worked fine on 10.1.2. In fact, it happens on 10.1.3 even for old executables (not recompiled) that definitely run fine under 10.1.2.

Before I put further work into isolating this and/or file a bug, has anyone else seen anything like it?
TIA,
Dan
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