No more input allowed in the input widgets of WindowMaker

I'm using Fedora core 4(gcc 4.0.1) and WindowMaker 0.92.0-3(rpm
version).

Sometimes no more key input allowed after first 2 characters in the
input widgets of WindowMaker. But I can't make it again for
representation.

Therefore I append screen-shot of this situation. It was captured when I
tried to type "xchat" to the 'run a command' window.

I want to know why this phenomenon has occurred and how can I fix it.

My system is:
	Kernel 2.6.12-1.1447_FC4
	libgcc 4.0.1-4.fc4

Any information will be help to me...

Thanks,
JHB

PS) I'm looking shy gcc 4.0. Some other programs(like mplayer) show some
strange behaviors too but they're working anyway...

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